RHYTHMIC PRECIPITATION OF SILVER CHLORIDE IN GELATIN TANNED WITH CHROMIUM CHLORIDE.

On allowing a highly concentrated silver nitrate solution to diffuse into a gelatin gel, tanned with CrCl₃ of such concentrations that all the available Cl' is combined with the gelatin, in a test tube, dirty white rings of AgCl have been obtained. The study of the influence of concentration of gelatin, CrCl₃, and AgNO₃ on the dimensions of the rings and interspaces shows that they behave differently from those of Ag₂Cr₁O₇ rings in gelatin mixed with K₂Cr₂O₇.