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A new photochromic compound was found. Dimethylammonium molybdate (DMAM) represented by the ideal formula {(CH3)2NH2}2O·3MoO3·H2O colored remarkably to the reddish brown on exposure to UV and returned to the original white by thermal fading. DMAM exhibited photochromic phenomena in the solid state and the correlation between coloration and UV-induced ESR signals was found.
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Yamase et al. (1973) studied this question.
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