1. Use of Standard Color Samples: Employ international standard color charts (such as Pantone color cards) or internal standard color samples to ensure consistent reference standards throughout the production process.

2. Colorimeter Measurement: Use color measurement instruments (spectrophotometer or colorimeter) for accurate color measurement. These instruments can provide numerical color difference data.

3. Establish Strict Quality Control Standards: Develop detailed color tolerance standards to ensure that each batch of products conforms to predefined color difference ranges.

4. Batch Control: For different batches of raw materials, adjust process parameters promptly to ensure color consistency. Conduct regular sample testing during the production process.

5. Standard Light Sources: Use standard light sources during color evaluation and inspection to ensure color comparison under consistent lighting conditions.

6. Employee Training: Provide specialized training for employees involved in color control, educating them on how to correctly use color measurement instruments, understand color standards, and address color difference issues.

7. Adjust Process Parameters: Control parameters such as spray pressure, temperature, and humidity during coating, printing, or dyeing processes to ensure color consistency.

8. Regular Equipment Calibration: Periodically calibrate color measurement instruments and other relevant equipment to maintain their accuracy and reliability.

9. Automation Systems: Introduce automation systems to monitor and adjust the production process, reducing the impact of human factors on color difference.

10. Traceability: Establish a traceability system for product colors, allowing quick identification and resolution of color difference issues by tracing back to each batch of raw materials and production processes.

By employing these color difference control methods collectively, it is possible to effectively enhance color consistency in products, reduce quality issues caused by color differences, and ensure production stability and reliability.