Abstract
Equations developed previously for the titration of fibrous proteins with acids are shown to accord with extant data for the adsorption of dyes in the presence of salt. The contribution of particular groups in the dye molecules to the free energy of adsorption is determined, and the influence of the valency of the dye ion is related to the potential on the protein fibre. The effect of temperature on the ionic equilibria is calculated, and estimated experimentally for a simple dye using a rapid 'null' method for the attainment of equilibrium.

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