I—a Simple Technique for Investigating the Effect of Humidity on the Fading and Degradation of Dyed Fabrics by Sunlight, and Some Observations on Dyed Cotton

Effect of Hydroquinone on Light-Induced Degradation of Nylon 6 Dyed with SolubilizedVat Dyes

“…This is in agreement with the findings of Egerton [ 11 that many of the vat dyes which sensitize the photochemical degradation of nylon are least fast to light on this fiber. Similarly, Ashton and Probert [2] in their studies on photochemical tendering of cotton in the presence of insoluble azo and vat dyes found a close statistical correlation between and those of Egerton [11] ] and Ashton and Probert [2] can be explained in view of the suggestions of Markuze [21 ]. He has reported in his studies on the kinetics of photodegradation of dyed silk that with photosensitizing dyes, absorbed energy is dissipated in oxidative reactions causing degradation of the fiber, whereas lightfast dyes convert this energy to heat energy.…”

“…Interest in the processing of wool and wool blends on the short staple system [ 1,2,3,5,9] has increased because of apparently higher profit from these yams [7] compared to those made by conventional methods. Short staple wool is scarce and so the available wool must be shortened by cutting or stretch-breaking the fibers in the sliver state [8], These fiber-shortening methods add to cost, however, because the wool must be processed into tops before the fibers can be shortened.…”

“…When cotton dyed with certain vat dyes is exposed to sunlight, its photochemical activity accelerates [2,6,9,12,13,18]. Such catalytic activity is a serious defect for dyes that may be satisfactory from other points of view including fastness to light [29].…”

Photochemistry of Cotton and Chemically Modified Cotton

“…Photosensitization of cellulosic fibers in the presence of phototendering vat dyes has heen studied in detail and different mechanisms have been suggested with a view of explaining the mode of cellulose degradation [2,7,12,15]. However, except for the work of Berard, Gremillion, and Goldthwait [ 3 ] , who showed that cotton could be made resistant to degradation by first dyeing with certain lightstahle vat dyes followed by partial acetylation, very little information is available in the literature regarding the photochemical behavior of chemically modified cottons during photosensitization.…”