Effect of Light and Heat on Color and Deterioration of Viscose, Acetate, and Cuprammonium Fabrics

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Abstract
Light decreased the breaking strength of the viscose, acetate and cuprammonium rayons uniformly. Heat decreased the break ing strength of all of them considerably, but the cellulose acetate rayons were more resistant to heat than the other two kinds. Light produced little change and heat much change in color. The cellu lose acetate rayon fabrics were affected the least. The ash alka linity showed no perceptible increase or decrease for any of the rayons exposed to light or heat. The amount of increase in the copper number and per cent solubility in sodium hydroxide was ap proximately the same for the viscose and cuprammonium rayon fabrics, and it was less in the case of the cellulose acetate rayon fab rics. Thus the greater change in breaking strength, copper number and per cent solubility in sodium hydroxide indicates that the viscose and cuprammonium rayon fabrics were deteriorated more by heat than the cellulose acetate rayon fabrics.

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