We at WENYAO take great satisfaction in being one of the industry’s most reliable suppliers of tea color sorters. Our specialty is offering cutting-edge China tea color sorting machines that are tailored to the particular requirements of the tea processing sector. Your tea production lines will achieve the highest quality requirements thanks to the accuracy, speed, and efficiency of our tea color sorter machines, such the WYT4V3 model.

Why Choose WENYAO as Your Tea Color Sorter Supplier

As a leading tea color sorter supplier, WENYAO’s focus is on delivering reliable and high-performance machines that meet the unique needs of tea processors. The WYT4V3 tea color sorter is a prime example of our commitment to excellence. By using advanced technology, our China tea color sorter machines efficiently separate defective tea leaves based on color, size, and shape. This results in higher quality tea products, reduced waste, and improved customer satisfaction. Whether you’re in the green tea, black tea, or herbal tea market, WENYAO’s machines ensure your tea products stand out for their consistency and purity.

Key Features of the WENYAO WYT4V3 Tea Color Sorter Machine

WENYAO’s WYT4V3 tea color sorter machine comes equipped with advanced features designed to enhance the tea sorting process. With a power of 9.5 KW and versatile voltage support (180-240V, 50HZ), this model is well-suited for diverse operational environments. Its efficient air pressure range of 0.6-0.8 MPa and low air consumption (<6.0 m³/Min) ensure optimal performance while maintaining energy efficiency. With a compact dimension of  2015*2280*2365 MM, it is built to fit seamlessly into various production setups.

Applications of WENYAO’s Tea Color Sorter Machines

WENYAO’s tea color sorter machines, such as the WYT4V3, have a wide range of applications in the tea processing industry. From quality control to grading and sorting, our machines are designed to enhance every stage of tea production. By automating the sorting process, we help businesses improve their efficiency, ensuring that they can meet market demands while maintaining high-quality standards. Whether you are sorting loose tea or pre-packed products, our China tea color sorter solutions can adapt to your specific requirements, increasing your productivity and profitability.

Conclusion

As one of the leading tea color sorter suppliers, WENYAO provides cutting-edge China tea color sorter solutions like the WYT4V3 model that help businesses improve sorting accuracy, enhance production efficiency, and reduce costs. With applications ranging from quality control to grading and sorting, our machines are an essential tool for businesses in the tea processing industry. By choosing WENYAO, you’re investing in high-quality technology that will help your business thrive. Contact us today to learn how we can support your tea sorting needs.

At WENYAO, we understand that the quality of tea is paramount for businesses in the beverage industry. Our tea color sorter machines are designed to optimize the sorting process, ensuring that only the finest tea leaves reach consumers. By investing in our advanced technology, you can enhance the quality of your products and gain a competitive edge in the market.

The Importance of Tea Color Sorters

Tea color sorters play a crucial role in the tea processing industry. They effectively identify and remove defective leaves and impurities based on color. Our WYT1V3 model is a cutting-edge china tea sorting machine that utilizes the latest UHD imaging and analysis technology. This enables high-speed processing and accurate identification of different tea grades. By integrating our tea color sorting technology, businesses can significantly reduce manual sorting errors, resulting in higher quality tea for customers.

Features of WENYAO’s Mini Tea Color Sorter

The WENYAO mini tea color sorter is an innovative solution designed for small to medium-sized operations. Despite its compact size, this machine offers powerful functionality. It features a high-level AI self-learning function, which allows the machine to adapt and improve its sorting accuracy over time. The user-friendly interface ensures easy operation, making it accessible for all staff members. Additionally, its small footprint saves space and reduces delivery costs, proving that a mini tea color sorter can deliver exceptional results without compromising on performance.

Advantages of Choosing WENYAO

Choosing WENYAO for your tea sorting needs comes with numerous advantages. Our china tea sorting machine, the WYT1V3, ensures high stability and sorting accuracy, with minimal carryover and low energy consumption. This means you can operate efficiently while maintaining high standards of quality. Our machines are built to last, providing a reliable solution for your tea processing needs. By opting for our technology, you not only enhance your product quality but also improve your operational efficiency.

Applications of Tea Color Sorting

The applications of our tea color sorter machines are extensive. They are widely used in sorting various types of tea, including green tea, black tea, and herbal blends. By implementing our tea color sorting technology, businesses can ensure that only the best quality leaves are packaged and sold. This level of precision in sorting enhances the overall quality of your products, leading to increased customer satisfaction and loyalty.

Conclusion

In conclusion, WENYAO’s tea color sorter machines are essential for any tea processing business aiming to improve product quality and operational efficiency. Our WYT1V3 model, along with the mini tea color sorter, offers advanced features that make tea sorting an efficient and reliable process. We are dedicated to providing innovative solutions tailored to your specific needs. Contact us today to learn how WENYAO can enhance your tea sorting operations and help you deliver the best quality tea to your customers.

At WENYAO, we are proud to be one of the top grain color sorter manufacturers in China, offering advanced sorting solutions designed for businesses of all sizes. Our China grain color sorter machines, including the innovative WYCS1-128, provide unmatched precision, efficiency, and reliability. With features like systematic design, multi-dimensional sorting capabilities, and an intelligent interface, our machines set a new standard for quality and performance in grain sorting.

Why Choose WENYAO’s China Grain Color Sorter Machines

Our China grain color sorter solutions are engineered to handle a wide range of grains, ensuring high levels of sorting accuracy. The WYCS1-128 is equipped with a unique, systematic design that focuses on precise defect detection and removal. By utilizing multi-dimensional intelligent sorting, it ensures that only the highest-quality grains are selected, enhancing your product value. Whether you’re in agriculture, food processing, or industrial sectors, WENYAO’s color sorters deliver consistent results you can rely on.

The WYCS2-128 Grain Color Sorter’s salient features

The WYCS2-128 is a top-tier grain color sorter that combines advanced technology with reliable performance. It offers an impressive 128 channels for sorting, ensuring high throughput and precise separation. With a sorting accuracy of ≥99.9%, this model guarantees exceptional quality control, allowing businesses to produce premium-grade grains with minimal defects. Its output capacity, depending on raw material impurity, can reach up to 1600 kg/h, making it an ideal solution for large-scale grain sorting operations. Equipped with multi-dimensional intelligent color sorting technology, the WYCS2-128 analyzes grain characteristics in great detail. This advanced system effectively distinguishes between quality grains and defective ones, ensuring that only the best grains make it to the final product. Whether it’s sorting by color, shape, or size, this sorter offers precise and consistent results, meeting the highest industry standards.

Benefits of Partnering with WENYAO

As leading grain color sorter manufacturers, we focus on providing solutions that meet the diverse needs of our clients. The WYCS1-128 delivers reliable sorting performance while being easy to operate and maintain. At WENYAO, we not only offer high-quality products but also provide comprehensive support, including installation guidance and training. This ensures that you can fully utilize the capabilities of our China grain color sorter machines to maximize productivity and reduce waste in your operations.

Conclusion

WENYAO stands at the forefront of grain color sorter manufacturers, providing businesses with cutting-edge solutions like the WYCS1-128. With its systematic design, multi-dimensional intelligent sorting, and user-friendly interface, our China grain color sorter machines help businesses achieve superior sorting precision and efficiency. Whether you need to sort wheat, rice, or other grains, WENYAO’s color sorters are designed to meet your specific requirements. Contact us today to learn more about how our advanced sorting technology can enhance your operations and drive success.

At WENYAO, we recognize that quality control is vital for businesses in the grain industry. Our grain color sorter machines are engineered to enhance the sorting process, ensuring that only the best products reach consumers. By utilizing our advanced technology, companies can streamline their operations and improve product quality, thus gaining a competitive edge in the market.

The Role of Grain Color Sorters

Grain color sorters are essential tools for any grain processing operation. They work by detecting color variations in grains, allowing for the quick elimination of defective products and impurities. Our WYCS4-768 model features twelve chutes, providing an unparalleled sorting capacity. This advanced grain color sorter is designed for efficiency, enabling businesses to sort large volumes of grain with speed and precision. By integrating a grain color sorting system into your operations, you can significantly reduce the risk of human error and enhance overall productivity.

How WENYAO’s Grain Color Sorting Works

Our grain color sorting technology operates through a user-friendly interface, featuring an easy-to-use touch screen available in over 20 languages, including Spanish, German, and Russian. This accessibility ensures that operators can quickly learn and manage the machine, making training efficient. The sorting process begins with our specialized sensors that analyze each grain as it passes through the chutes. If any grains are identified as defective or substandard, our system immediately ejects them, maintaining the highest quality standards for your products.

Advantages of Choosing WENYAO

Choosing WENYAO for your grain color sorter needs comes with several benefits. Our machines are built to last, utilizing high-quality materials that ensure durability and reliability. The twelve-chute design of our WYCS4-768 model allows for increased throughput, making it suitable for large-scale operations. Additionally, our factory direct sales model eliminates middlemen, allowing us to offer competitive pricing without compromising on quality. This approach not only saves costs but also ensures that you receive the best value for your investment.

Applications of Grain Color Sorting

The applications for grain color sorting are vast and varied. Our machines are adept at sorting various grains, including rice, corn, wheat, and pulses. By implementing WENYAO’s technology, businesses can enhance their sorting accuracy, ensuring that only the finest grains are packaged and sold. This level of precision not only improves product quality but also boosts customer satisfaction and brand reputation.

Conclusion

In conclusion, WENYAO’s grain color sorter machines are essential for any grain processing operation aiming to improve efficiency and quality. Our WYCS4-768 model offers advanced features and a user-friendly design that makes grain color sorting an effortless process. We are committed to helping our clients achieve their goals through innovative solutions tailored to their specific needs. Contact us today to discover how WENYAO can elevate your grain sorting processes and enhance the quality of your products.

When it comes to rice sorting, efficiency, speed, and accuracy are essential. As a leading rice color sorter factory, WENYAO is proud to provide innovative solutions tailored to meet the needs of businesses worldwide. Our China rice color sorter machines, such as the WYCS10-640 model, are designed to maximize sorting accuracy while minimizing downtime and waste. By utilizing cutting-edge technology and a factory direct sales model, we offer cost-effective solutions that ensure optimal performance for your rice sorting needs.

Why Choose WENYAO’s Rice Color Sorter Factory

At WENYAO, we understand the importance of precision in rice sorting. Our rice color sorter factory produces high-quality machines like the WYCS10-640, which is equipped with a 5400-pixel CCD image acquisition system. This advanced system allows for quick and precise identification of rice defects and impurities, ensuring only the highest-quality rice reaches your customers. By investing in our China rice color sorter technology, you can streamline your operations, reduce waste, and increase overall efficiency.

Advanced Features of Our China Rice Color Sorter Machines

The China rice color sorter machines from WENYAO, such as the WYCS10-640, come equipped with an automatic computing and intelligent identification system. This system ensures that every grain of rice is inspected with accuracy and speed, improving sorting performance by removing damaged or off-color rice grains. Additionally, our self-designed high-frequency ejectors deliver high-speed, accurate sorting, enabling you to maintain consistent product quality at all times. These features make our rice color sorters ideal for large-scale rice processing operations looking to enhance sorting capabilities.

Benefits of Partnering with WENYAO’s Rice Color Sorter Factory

As a rice color sorter factory based in China, WENYAO provides direct access to high-quality sorting equipment at competitive prices. Our machines are built to last, with durable components designed for long-term performance. The WYCS10-640 model features high-speed sensors, intelligent cameras, and a sophisticated ejector system that ensures efficient and reliable operation. When you choose WENYAO, you’re not just investing in advanced technology—you’re partnering with a company dedicated to providing ongoing support. Our team offers installation guidance and training services to ensure you can operate the machines without issue.

Conclusion

As a leading rice color sorter factory, WENYAO’s China rice color sorter machines, like the WYCS10-640, deliver unmatched performance, efficiency, and value. With cutting-edge features such as a 5400-pixel CCD system, intelligent identification, and self-designed ejectors, we ensure that your rice sorting process runs smoothly, efficiently, and at the highest quality standards. Whether you’re looking to upgrade your existing equipment or make your first purchase, WENYAO is your trusted partner in rice sorting. Contact us today to learn more about how our rice color sorter factory can help you take your business to the next level.

At WENYAO, we understand the crucial role that quality plays in the rice industry. Our rice color sorter machines are designed to ensure that only the best grains make it to market. By investing in our advanced technology, businesses can significantly improve their sorting processes, leading to higher quality products and increased customer satisfaction.

The Importance of Rice Color Sorters

A rice color sorter is an essential tool for any rice processing facility. These machines utilize advanced technology to identify and eliminate defective grains and impurities based on color. With our rice color sorter machines, we offer a reliable solution that enhances the efficiency and accuracy of the sorting process. Our WYCS1-64 model, equipped with a single chute, exemplifies our commitment to innovation. It ensures a smooth and uniform distribution of materials, optimizing the sorting process while maintaining high standards.

How WENYAO’s Rice Color Sorter Machines Work

Our rice color sorter machine operates through a systematic and original design. When the color sorter is in action, the feed hopper, assisted by a vibrator, distributes the rice evenly across each chute. As the grains descend, our advanced CCD sensors continuously analyze their color. If any unqualified materials or impurities are detected, the machine’s ejector swiftly blows the defective goods out of the hopper, ensuring that only the highest quality rice reaches the packaging stage. This multi-dimensional intelligent color sorting capability sets our machines apart in the market.

Benefits of Choosing WENYAO

Choosing WENYAO means opting for quality and efficiency. Our rice color sorter machines not only enhance sorting accuracy but also reduce labor costs associated with manual sorting. By automating this process, we help businesses improve their operational efficiency. The durable construction of our machines ensures longevity, making them a worthwhile investment for any rice processing facility. Additionally, our factory direct sales model allows us to offer competitive pricing without sacrificing quality.

Applications in the Rice Industry

Our rice color sorter machines are widely utilized in various rice processing applications. Whether sorting white rice, brown rice, or specialty varieties, our technology adapts to meet the specific needs of our clients. With the ability to detect even the slightest color variations, we help ensure that only the finest rice is delivered to consumers. This level of precision enhances the overall quality of the product and boosts the reputation of the brand.

Conclusion

In conclusion, WENYAO‘s rice color sorter machines represent a significant advancement in the rice processing industry. By incorporating our WYCS1-64 model into your operations, you can enhance sorting accuracy, improve product quality, and increase efficiency. We are dedicated to providing our customers with the best solutions in color sorting technology. Contact us today to learn more about how WENYAO can help elevate your rice processing capabilities and ensure that you deliver only the best to your customers.

Choosing the appropriate equipment can have a significant impact on both operating efficiency and product quality in the industrial sorting industry. WENYAO specializes in offering wholesale color sorting solutions that are customized to satisfy the requirements of companies in a range of industries. Our vision color sorter machines are distinguished by their accuracy, dependability, and capacity to boost output, guaranteeing that your company can continue to offer competitive prices and superior quality standards.

The Advantages of Choosing WENYAO’s Wholesale Color Sorter

WENYAO’s wholesale color sorter machines are designed to streamline sorting processes and reduce waste. Whether you are sorting grains, plastics, or nuts, our machines use advanced vision technology to identify and remove unwanted materials based on color, shape, and size. By opting for wholesale color sorter equipment, businesses can benefit from reduced labor costs and more consistent product quality. This direct-from-factory model ensures you get high-tech equipment at highly competitive prices, allowing you to maximize your return on investment.

How Vision Color Sorters Enhance Precision

At the heart of WENYAO’s sorting solutions lies our vision color sorter technology, which leverages high-resolution cameras and advanced image processing algorithms to analyze the characteristics of the materials passing through the sorter. The vision color sorter machines can precisely identify even the smallest color discrepancies, allowing for the removal of foreign materials or defective items with accuracy that human labor cannot match. This advanced technology reduces human error, increases throughput, and ensures the high standards your customers expect.

Why WENYAO’s Vision Color Sorter Stands Out

Our vision color sorter machines are built with durable, high-performance components, including high-speed sensors and efficient LED lighting, ensuring consistent results over time. WENYAO’s machines are engineered for long-term reliability, minimizing downtime and maintenance costs. Designed for industries like agriculture, food processing, and plastics recycling, our wholesale color sorter solutions are adaptable to various sorting needs, making them a smart investment for businesses looking to scale operations efficiently.

Conclusion

WENYAO’s wholesale color sorter and vision color sorter machines provide businesses with the tools they need to enhance productivity, improve product quality, and reduce operational costs. With our advanced technology, customizable options, and direct-from-factory pricing, we offer unbeatable value. Whether you’re looking to optimize your current sorting process or invest in a new system, WENYAO’s color sorters are the solution you need to stay ahead of the competition. Contact us today to learn more about how we can help your business succeed.

In today’s competitive market, ensuring product quality is paramount. At WENYAO, we specialize in manufacturing advanced color sorter machines designed to enhance the efficiency of your production line. Our commitment to quality and innovation enables us to offer top-notch color sorters that meet the specific needs of various industries. By adopting our color sorter technology, businesses can achieve superior sorting results, ensuring that only the best products reach the consumer.

Why Choose a Color Sorter

Color sorters are essential tools for businesses looking to optimize their sorting processes. With the ability to sort materials based on color, these machines significantly reduce the chances of human error and increase sorting speed. At WENYAO, our color sorter machines feature cutting-edge technology, including high-speed sensors and 5400-pixel cameras, providing sorting accuracy of up to 0.02mm². This precision ensures that even the smallest defects are detected and removed, guaranteeing the highest quality of your products.

The Advantages of WENYAO’s Color Sorter Machines

WENYAO’s color sorter machines offer several advantages that set them apart from the competition. First and foremost, our factory direct sales model eliminates intermediary costs, allowing us to offer competitive pricing without compromising on quality. Additionally, we provide customization services, ensuring that each machine is tailored to meet the specific requirements of our clients. Our commitment to customer satisfaction extends beyond the sale; we offer online installation guidance and offline training services to ensure seamless operation of our equipment.

Moreover, we understand that equipment downtime can be costly. That’s why WENYAO ensures rapid support in the event of a malfunction. Our skilled engineers are ready to provide on-site repairs, minimizing disruption and keeping your operations running smoothly.

Applications of Color Sorter Machines

The versatility of WENYAO’s color sorter machines makes them suitable for a wide range of applications. These machines are widely used in sorting agricultural products such as rice, wheat, and corn, as well as industrial materials like nuts, tea, and plastics. The ability to quickly and accurately sort these products not only improves efficiency but also enhances the overall quality of the final output.

Conclusion

In conclusion, investing in a color sorter machine from WENYAO is a strategic move for any business aiming to enhance product quality and operational efficiency. With our advanced technology, competitive pricing, and dedicated customer support, we are here to help you succeed. Explore how WENYAO’s color sorter solutions can transform your sorting processes and elevate your business to new heights. Contact us today to learn more about our offerings and how we can assist you in achieving your production goals.

Welcome to the Taiho Lecture Hall! This online training class is designed for color sorter maintenance engineers. In our last class, we learned how to adjust and operate the color sorter. In this class, we will focus on solving a specific problem: how to address sorting performance that is not as good as before.

Troubleshooting Poor Sorting Performance

When your color sorter’s performance declines, follow these steps to identify and resolve the issue:

1. Check Material Feeding Uniformity

Check whether the material is feeding evenly on each chute.

• Action: If there is an obvious difference in feeding, adjust the feeding number and use the touch screen to ensure the same material feeding speed for each chute.
• Note: If the feeding is already even for each chute, no further adjustment is needed at this step.

2. Compare Current and Previous Material

Assess if there is a significant difference between the current and previous materials and check the sorting capacity.

• If Contamination Slightly Increased:
• Example: Presence of light yellow rice.
• Action: Adjust the sensitivity of light yellow by increasing the color sensitivity by two to three points on both the front view and rear view.
• Goal: Check if the acceptance improves until sorting is satisfactory.
• If Contamination Significantly Increased:
• Action: Decrease the feeding speed and increase sensitivity accordingly to improve sorting quality.
• If Raw Material Remains the Same:
• Action: Inspect the glass from the sorting window to ensure it is clean.
• Solution: If dust is present on the glass, use a soft cloth to clean it manually and check if the sorting quality improves.

3. Inspect the Outlet Chute

Open the window of the outlet chute and check for the following:

• Divider Plate: Ensure it is not loose.
• Material Blockage: Verify that no material is stuck in the chute.
• Action: If the divider plate is loose or material is stuck, resolve the issue accordingly.

4. Verify Signal Settings

Navigate to the signal setting interface on the touch screen.

• Action: Check if the signal is correct for each chute.
• Note: If you cannot improve sorting performance after completing all the above steps, please contact our support team promptly.

Conclusion

Maintaining optimal sorting performance in your color sorter involves systematic troubleshooting. By ensuring even material feeding, adjusting sensitivity based on material contamination, keeping the sorting window clean, and verifying signal settings, you can address and resolve common performance issues effectively.

Frequently Asked Questions (FAQs)

1. What should I do if the material feeding is uneven across the chutes?

If you notice an obvious difference in material feeding across the chutes, adjust the feeding number using the touch screen to maintain the same feeding speed for each chute. Ensuring uniform feeding is crucial for consistent sorting performance.

2. How do I adjust the sensitivity if the raw material contamination has increased slightly?

If contamination has increased slightly, such as the presence of light yellow rice, increase the color sensitivity by two to three points on both the front view and rear view. This adjustment helps improve the acceptance rate until the sorting quality is satisfactory.

3. What steps should I take if the sorting performance does not improve after all adjustments?

If sorting performance does not improve after ensuring even feeding, adjusting sensitivity, cleaning the sorting window, and checking the outlet chute, you should contact our after-sales support team for further assistance. There may be underlying issues that require professional attention.

Welcome to the Taiha Online Training Lecture! In this blog post, we will explore the essentials of color sorter machines, specifically focusing on maintenance adjustments during operation. This guide is designed for color sorter maintenance engineers and will help you understand the key components and adjustment methods to ensure optimal performance of your color sorter.

Introduction to Color Sorter Maintenance

In the last lesson, we discussed the important aspects to pay attention to before starting the color sorter. Today, we will delve into the parts that need to be adjusted and operated while the color sorter is working. Using the Observation Rice Color Sorter as an example, we will share common changes in raw materials or sorting requirements that you often encounter in daily processing and production. Additionally, we will cover how to make corresponding adjustments to production flow, sensitivity, and other parameters.

Adjustment Methods for Commonly Used Parameters

1. Consistency Adjustment of Feeding

Uniform feeding across each channel is crucial to ensure the consistency of the entire color sorter during production. To achieve this:

• Visual Check: Ensure that the feeding speed of all channels is uniform.
• Adjustment Method: Enter the feeder adjustment interface while the machine is running. Adjust the feeding amount of each channel to achieve uniformity. A larger number of feet increases the feeding speed and vibration, while reducing the number decreases the speed.
• Note: Most of the time, it is not necessary to adjust the feeder repeatedly as long as the operation is even and smooth.

2. Light Adjustment

Optimal sorting cannot be achieved without coordinating reasonable foreground and setting light. The adjustment and fixation of the partition are handled by the after-sales engineer, who will set the best plan and save it for you during commissioning and installation.

3. Sensitivity Adjustment

Sensitivity adjustment is complex and directly influences the effectiveness of color sorting. It is the most frequently used parameter in daily processing. The sensitivity interface parameters can be described by their specific functions:

• Lower Limit of Front Speckle and Back Speckle: Aimed at eliminating small diseased spots and small blackheads in rice.
• Lower Limit of Forward Region and Rear Region: Aimed at eliminating dark yellow rice.
• Color Sensitivity of Front Vision and Rear Vision: Aimed at eliminating light yellow rice.

Fine-Tuning Sensitivity:

• To eliminate light yellow rice, add the front color and color without adding the speckle and lower limit of the region.
• To eliminate dark yellow and black spots, reduce or turn off the color sensitivity and use only speckle and region sensitivity.

By adjusting these parameters according to your specific requirements, you can enhance the sorting efficiency and quality of your color sorter machine.

Conclusion

Maintaining and adjusting your color sorter machine is essential for consistent and high-quality sorting performance. By focusing on feeding consistency, light adjustment, and sensitivity settings, you can ensure that your color sorter operates smoothly and effectively meets your production needs.

Frequently Asked Questions (FAQs)

1. Why is uniform feeding important in a color sorter machine?

Uniform feeding ensures that each channel operates consistently, which is crucial for maintaining the overall performance and accuracy of the color sorter during production.

2. How often should I adjust the feeder settings on my color sorter?

Most of the time, it is not necessary to adjust the feeder repeatedly as long as the operation is even and smooth. However, adjustments may be needed if there are changes in raw materials or sorting requirements.

3. What is the role of sensitivity adjustment in a color sorter machine?

Sensitivity adjustment directly influences the effectiveness of color sorting. It helps eliminate unwanted variations such as diseased spots, blackheads, dark yellow rice, and light yellow rice by fine-tuning the machine’s ability to detect and sort based on color differences.