A Study of the Kinetics of Dye Transfer in the Rub-fastness Testing of a Vat Dye

The kinetics of the crocking (rub fastness) behaviour of a vat dye have been investigated in dry and wet conditions. It is suggested that the dye removal process can be treated as a reversible first-order reaction. A measure of the kinetic properties of the rubbing process can be given by the rate constant (k1) and/or the equilibrium constant (K) of the reaction. The effects of the force applied during rubbing on these constants were also studied