Pollution Control in Natural Colour Dyeing Through Dye Strength Approximation

摘要

Proper standardization of strength of dyes and dose of mordants, which are interrelated to each other, are extremely necessary for shade reproducibility as well as for the prevention of serious water pollution. Natural dyes are mostly obtained from vegetable sources which yield dyes according to their maturity, climate and soil. Hence the fact can not be denied that a natural dye manufacturer will feel the difficulties in controlling the dye strength as well as tone apart from the brightness which is inherent to natural dyes in most of the colorants. But strength approximation after dye manufacture for each batch can be done in terms of a standard metallic mordant from which the doses of other mordanting salts can be correlated. The dyers in small and big sectors can be able to follow the routine of application in an easy method which will help minimize the water pollution to some permissible level.