A study has been made of the action of near‐ultraviolet and visible radiation on anaerobic solutions of 1‐methylaminoanthraquinone and 1,4‐bismethylaminoanthraquinone in different organic solvents. Fading in hydrogen‐containing solvents occurs by reduction, but substantial fading is also observed in carbon tetrachloride solution.
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Egerton et al. (1967) studied this question.