Photochemistry in relation to Garment Dyeing and Dry Cleaning

An attempt has been made to determine the effect of dyes on the photochemical oxidation of wool. Generally, dyes offer protection to wool, but differ greatly in the degree of protection. Certain groups offer little protection, and in some cases cause acceleration of damage. The triphenylmethane group appears to offer least protection. No clearly defined effect of any chemical group of dyes or of any hue can be detected. The influence of a particular dye on the rate of disintegration of wool under the action˜of light lias an important bearing on the redyeing of worn garments and also on the launderability of such garments.