Patent ID: 7476263
Filing Date: 2009-01-13
Classification: D06M,D06P

Abstract:
1. A coloring method of a tangible matter having a polyamide bond, consisting essentially of treating the tangible matter having a polyamide bond with an aqueous solution containing an aromatic derivative having one or more hydroxyl groups selected from the group consisting of dihydroxybenzoic acid, dihydroxybenzaldehyde, trihydroxybenzoic acid and trihydroxybenzaldehyde, and a metal salt selected from the group consisting of iron (II or III) salt, copper salt, aluminum salt and nickel salt, wherein the salt is a nitrate, sulfate, chloride, acetate or citrate, at a temperature of 45° C. to 100° C., simultaneously or separately, wherein the treatment time ranges from 0.5 to 3 hours and the tangible matter is colored without using any dye.