The effect of various factors (oxygen, temperature and humidity, atmospheric contaminants and concentration of dye) on the fading of dyes is discussed. The phototropic behaviour of azo and thioindigoid dyes is described. The fading products resulting from the prolonged irradiation of dyes are discussed, as is the relation between the light‐fastness properties of a dye and its chemical constitution.
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Egerton et al. (1970) studied this question.
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