Abstract
AbstractIrradiation of dl‐mandelic, phenylacetic, formic, malonic or dl‐tartaric acid in aqueous or ethanolic solutions with U. V. light results in the photodecomposition of these acids into ·COOH and the respective residual radicals. The ·COOH radical has strong reducing properties and can reduce azo dyes, if they are added to the solution prior to irradiation, to amines. The residual radicals formed together with ·COOH upon photodecomposition of the carboxylic acids, can cause fading of the dyes either by reduction or by addition to the chromophoric system.
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