Method for reducing the toxicity of spent liquors and novel cationic dyes

摘要

There has been found 1) a method for reducing the toxicity of spent liquors from dyeing with cationic dyes or mixtures thereof, characterized by the step of dyeing with cationic dyes having a computed electrostatic shielding energy (idealized hydration energy) of >/=50 kcal/mol, 2) cationic, generally low toxicity dyes, their preparation and use for dyeing.