Abstract: Considering the staining concept, the union color formula of PA/cotton fabric was established based on the theory of computer measuring and matching color. The influence degree of acid dye staining on cotton and reactive dye on PA were studied, and the results showed that the influence of acid dye staining on cotton could be neglected but the influence of reactive dye on PA could not be neglected. The union color formula was simplified according to this result. The matching union color method of PA/cotton fabric was established and the accuracy of this method was tested. The result showed the union dyed PA/cotton fabric was available. The staining concept was implanted in the theory of measuring and matching color, and the method of matching union color on PA/cotton fabric was established in this paper. It provided reference for the application of computer measuring and matching union color on two-component fabric.

Key words: PA/cotton fabric, union color, comprter color measuring and matching, staining