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SynopsisThree azoic coupling components were purified and applied at different concentrations on standard cellulose and a series of chemically modified celluloses, involving oxidation with potassium periodate and potassium dichromate, as well as further borohydride reduction or chlorous acid oxidation of the oxycelluloses. Thermodynamic affinities of the azoic coupling components for all the chemically modified celluloses were determined from the adsorption data. As shown in the earlier studies on the affinity of vat and direct dyes for chemically modified celluloses, the affinity of the azoic coupling components also decreased with increasing degree of oxidation and increased after the oxycelluloses were reduced with sodium borohydride, though not to the extent of that for standard cellulose.