Mechanism of Dyeing with Procion Dyes III—Determination of the Affinities and Integral Diffusion Coefficients of Reactive Dyes from Alkaline Solutions

Abstract

A method is described for determining the affinities and the integral diffusion coefficients of reactive dyes in alkaline solution. This entails measuring these quantities for two inactive compounds of structure similar to that of the dye, followed by extrapolation of the values for the active dye assuming parallel behaviour. In the measurement of diffusion coefficients, an initial experiment was carried out in which the ‘cell constant’ of the film was determined from the diffusion of potassium chloride. From this constant the approximate effective dimensions, rather than the physical dimensions of the film, were calculated.