Patent ID: 6251144
Filing Date: 2001-06-26
Classification: C11D,D06P

Abstract:
An improved method for introducing into the surface of indigo-dyed denim, localized areas of variation in color density and a high contrast between blue and white fibers of the denim, said method comprising laundering a denim material in the presence of pumice stone or an equivalent abrasive substance, wherein the improvement comprises, at a step in said method during which said pumice stones or an equivalent abrasive substance is added to achieve a stonewashed appearance, substituting for or adding to said pumice stones or equivalent abrasive substance by contacting the denim with:a. an effective amount of a redepositing cellulase sufficient to produce the variations in color density; andb. an effective amount of an added protease sufficient to reduce backstaining and increase the contrast between blue and white fibers in any order.