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Interaction of dyes in aqueous solution resul ts in differences in the spectrum of t h e mixture when compared with the SLlm of the spectra of t he individual dy s. A general survey, chiefly with azo dyes, was made to determine the effect of dye struc ture on this interaction. The effect of other factors on t he interaction of direct azo dyes was investigated. The addit ion of alcohol or non-ionic dctergent prevents th is interaction , while the presence of inorganic sal ts or an increase in dyc concentration appears to increa e t he extent of interaction. Th e effect of acids and bases is dependent upon the nature of t he dyes in t hc mixture. The results obtained arc consistent with the assumption that the forees involved in the interaction of direct azo dyes in mixtures are the same as those causing the aggregation of individual dyes and those binding these dyes to fibers.

Relation between the absorption spectra and the chemical constitution of dyes: XXIX. Interaction of direct azo dyes in aqueous solution