Abstract
In the borohydride dyeing process, indigo cannot be reduced by sodium borohydride to its reduced form without the addition of catalyst This catalyst, which is a metallic salt, is used to activate the reduction procedure of the reducing agent So, the reduction reaction of indigo depends significantly on the nature of this catalyst In this paper, the effect of 12 different metallic salts on the performances of the indigo reduction reaction has been discussed These performances were evaluated by measuring the indigo reduction yield as well as the color yield (K/S) of the dyed samples of cotton In these studies, It was found that the copper-based catalysts were the best and offered maximum performance