Introduction

Black is one of the highest volume shade dyed on cotton & synthetic textile material having all time great demand especially for casual wear (denims & garments). Amongst all the classes of dyestuffs, Sulphur black is an important class of dye for the colouration of cellulosics, being into existence for nearly a hundred years.The good fastness properties, cost effectiveness & ease of applicability under different processing conditions exhaust, semi-continuous and continuous make it one of the most popular dyestuffs. Further, a wide choice of selection of various forms conventional, leuco and solubilised form is the major factor contributing to the continuous existence & ever-increasing demand for this class of dyestuff.