The rates of diffusion of HCHO, OH- and developing agents in coated gelatin layers or gelatin gels were determined by the following three methods;(1) measurement of depth of lateral penetration into a coated gelatin layer, (2) determination of diffused amount across the interface of two contacting gels and (3) deterination of the amount of diffse-in from solution into gel.
The diffusion constant (D), which was derived considering the retardation by reactants in gelatin, was compared with the apparent diffusion constant (D
app.) which was derived without such a consideration, while the latter might be practically more useful.
The results show that, in ordinary photographic processing solutions, the reaction of OH- with the functional groups in gelatin during diffusion remarkably retards the OH- peneration which causes the large D/D
app. ratio as compared with that of HCHO, although the diffusion of the latter is also retarded to a smaller extent by consumption for tanning. No particular difference is observed between the diffusion in a layer and that in a gel.
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