Hydrolyzed collagen: A novel additive in cotton and leather dyeing

The effect of hydrolyzed collagen in the dyeing of cotton and leather was investigated. First of all, the compatibility of direct and anionic dyes with hydrolyzed collagen was studied at different pHs. Dyeing of cotton and leather was then carried out using various fractions of hydrolyzed collagen. The pH plays a very important role and the results indicate that there is synergistic effect of hydrolyzed collagen in the dyeing of leather. Even though the results are not promising in the case of cotton, there is a possibility to avoid the use of salt and to reuse the residual bath.

► First ever report on the use of hydrolyzed collagen in the dyeing of textiles and leather.
► Both cotton and leather dyeing mechanism elucidated.
► Cotton dye uptake lesser but a salt free dyeing is achieved.
► Direct dye effluent is reusable as it is free from salt.
► Synergistic effect in the dyeing of leather.