The effect of gelatin, glycerin and methylene blue concentration on the diffusion of a dye from gelatin-glycerin-water gels has been examined. The rate of diffusion depended on the pore size of the gel and on the viscosity of the interspace fluid. Except at very low concentrations of methylene blue, an aggregation factor must be added to those factors suggested by Friedman & Kraemer (1930) as controlling the rate of diffusion from gels.
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Nixon et al. (1967) studied this question.
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