Use 5-10ml/L 38° caustic soda, 1-2ml/L thermal stability dispersant and 3-5g/L insurance powder for treatment, and add 0.5-1g/L anthraquinone powder as an indicator. If the insurance powder and caustic soda are sufficient, anthraquinone will turn the color stripping solution red; if the color stripping solution turns yellow or brown, caustic soda and insurance powder must be further added. The fabric should be thoroughly washed after color removal.