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Cinnamic acid esters of poly(vinyl alcohol) and of cellulose are insolubilized by ultraviolet radiation. This response may be increased by the inclusion of simple organic compounds such as Crystal Violet carbinol and Michler's ketone. A method of measuring this response (in terms of a sensitivity value, S) based upon photographic sensitometry has been devised. Preliminary study indicates that an increase in S is accompanied by an increase in response to the longer wavelengths of light.
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Minsk et al. (1959) studied this question.
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