Reactive dyes are strongly covalently bonded with fibers, which ensures an exceptionally high dyefastness with regard to many physico-chemical factors, but with the exception of lightfastness. This article deals with the specific features of reactive dye fading on textile materials, depending on the nature of the bond between the dye and fiber, the dye concen tration in the fiber, and the spectral characteristics of the dyes exposed to mono- and polychromatic light.
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