Hartley's fractional crystallization and Weigert's effect.
In the course of slow evaporation of an azo-dye chrysophenine-saturated gelatin-water solution, dye crystals that developed two different interference colors were observed in the gelatin; the colors were yellow and blue. The crystals that produce a blue interference color undergo disintegration on exposure to non-polarized light from a mercury lamp.
Institute of Cybernetics, Georgian Academy of Sciences, 5, Sandro Euli Street, Tbilisi 10086, Georgia. tariel@cybern.acnet.ge
Tariel D
TD
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Nadia A
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Ebralidze