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FAQ: Is there any possibility of improving the light fastness of a reactive dyed material?
Fastness to light of a dye is influenced not only by the chemical constitution of the dye but also by several other factors such as physical state of dye in the substrate, concentration of dye in the fiber, nature of substrate, type of bond between dye and fiber, source of radiation and its intensity, temperature, humidity conditions, presence of foreign substances, atmospheric contaminants and after treatments given to dyed fabrics for improving its performance
characteristics. Inter-relations of these factors are so complex that no general rule can be established to describe their effects on the dyes and different fibers. Studies in light fastness of reactive dyes, when present in different fibers in the reacted form and hydrolyzed
un-reacted state shows wide reaction. In the case of mixture of reactive dyes, rate of fading of one dye can also depend on the other dye present in a combination.
In recent years, consumers demand high rating in light fastness depending on the end-use of dyed and printed fabrics. Exporter also demands high standard of light fastness.
Nowadays there are some new products being launched by various manufacturers in the name of UV protectors and they claim that use of these products would improve the light fastness considerably. Treating the fabric or
yarn using these products and subjecting them to light fastness tests have proved beyond doubt there is an increases the light fastness rating. See the table below.
But before venturing in to any bulk trial, I advise you to conduct a small batch trial and then proceed.
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