Denim clothing is mainly yarn-dyed, dyeing color difference there are many reasons, the following dyeing machine dyeing dye auxilaries are discussed.

The amount of dye auxiliaries also has a great effect on the color. Such as indigo, is generally used as a reducing agent caustic soda, insurance powder. However, the amount of caustic soda and safety powder has a great influence on the color of indigo dyed. When the amount of caustic soda is too large, the color light will turn red, while when the amount of caustic soda is small, the color light will turn blue. Sulfur dyes and VAT dyes are the same.

When the amount of alkali is too large, the color will be biased towards red light. Therefore, the dosage of auxiliaries should be strictly controlled when adjusting the process. But the auxiliaries should not be too small, because once the auxiliaries are less, the color fastness will be very poor. Chromatic light slants "inferior". Additional auxiliaries also are same as dye, quality is unstable also, want to undertake assay when each batch is bought, detect quality, such ability assures the stability of chromatic light.

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