Various kinds of phenyl ester compounds are synthesized and their uv-visible absorption spectra are measured in ethanol. Their protective effects against fading of Crystal Violet are also examined in cellulose acetate film. The application of simple uv absorbing compounds is not necessarily useful for improving the light fastness of triphenylmethane dyes. Nickel 4-benzoyloxybenzenesulfonate or 2-benzoyloxynaphthalene-6-sulfonate, however, almost perfectly suppress photofading rate of Crystal Violet. The introduction of a singlet oxygen quenching group into the uv absorber plays a very important role in improving the light fastness of triphenylmethane dyes.
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