Extraction of Natural Tea Dyes and Its Application on Silk Fabrics

The dyeing properties of the natural tea dyes on silk fabrics were studied.Through orthogonal test and single factor analysis,the influences of the dyeing temperature,pH value,temperature-holding time and dye mordant were discussed to obtain the optimal conditions of natural tea dyes on silk fabrics.The indexes of color fastness were also compared.The results showed that the silk fabric had good color yield and color fastness if dyed by post-mordant methods with copper ion for 60 minutes on the condition of liquor ratio 1∶20,boiling and weak acid(pH=4~5).