Standing bath technique for Indigo denim dyeing

摘要

Indigo dye has only moderate substantivity for cotton and lot of dye remains in the dye vats, creating major effluent problems. In the present investigation a new standing bath technique is developed for effluent free denim dyeing. The repeated reuse of an indigo vat of higher concentration could provide a wide range of lighter shades, with considerable cost savings. This could also probably provide a solution to the effluent problems faced by indigo dyeing units.