Abstract
A new theory of direct dyeing is presented in terms of the Langmuir theory of surface adsorption, modified to allow for the effect of foreign electrolyte in the dyebath. A simple formula is derived, relating the equilibrium absorption of dye to the dyebath concentration, the concentration of foreign electrolyte in the dyebath and the temperature. The formula is shown to account satisfactorily for the main features of the equilibrium dyeing of cellulose by Chrysophenine G in the presence of sodium chloride. The theory is used to calculate the energy of dyeing of cellulose by Chrysophenine G.
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