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Factors Affecting the Rate of Photoyellowing of Bleached and Fluorescently Whitened Wool Cloth

Israel Fiber Institute, Jerusalem 91080, Israel

The rate of photoyellowing, when wet, of wool cloth bleached conventionally with hydrogen peroxide and then with stabilized sodium dithionite depends on the pH of the dithionite bleaching bath. Between pH 3.5-7.5, the lower the pH. the higher the lightfastness. The enhanced photostability of damp fabric which has been dithionite-bleached at pH 3.5 is not fast to washing. Indeed, when washed under certain conditions, the wet wool becomes particularly sensitive to sunlight yellowing. These effects become very apparent on fabric treated with a fluorescent whitening agent. Cloth treated with sodium metabisulfite behaves similarly. The photostability of dry wool is not affected by bleaching or washing conditions. The lightfastness on wet and dry cloth of a selection of commercial fluorescent whitening agents is compared here.

Textile Research Journal, Vol. 55, No. 8, 477-483 (1985)
DOI: 10.1177/004051758505500805


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