The Adsorption of Dye Mixtures by Cellophane Sheet. I. Temperature and Concentration Dependence of Adsorption from Some Binary Mixtures

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Abstract
1) The amount of dyes adsorbed by Cellophane from two mixture dyeings of Chlorazol Sky Blue FF and Chrysophenine G, and Chlorazol Sky Blue FF and p-nitroaniline →γ acid (α-coupling) was measured. Further, the amount in case of single dyeing was also measured. 2) It was assumed that the reduction in adsorption of dyes from mixture dyeing is due to an interaction between the two dyes in the dyebath, and that this interaction means only the formation of complexes. On this assumption, the instability constant in the case of the pair of Blue dye and Yellow dye was calculated, according to the mass action law, but it was impossible to calculate it in the case of the pair of Acid dye and Blue dye, because the composition of complexes of this pair was not constant. 3) How the amount of Blue dye adsorbed from mixture dyeing varies with the sort and the concentration of its partner dye and with the dyeing temperature was discussed from the standpoint of the instability constant and the affinity.

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