Factors exerting influence on light fastness of the reactive dyeings

This paper discussed the influence of reactive dye type,dye concentration,mixture of dyestuffs and pH value of fabric on color fastness to the combination of sunlight and perspiration.Effects of various functional finishing on color fastness were discussed,such as softening,wrinkle resistance,Nano-Tex water and oil repellent,and improving the fastness to chlorine.The results showed that color fastness to light was related to reactive dyestuff type and dye concentration.Color fastness to light of fabric in light shade was poorer than that in dark.Light colorfastness of fabric dyed with mixed dyestuffs is generally dependent upon the dye with the poorest light fastness.The promoter to light color fastness,which is compatible with other functional finishing chemicals,can significantly improve light color fastness.