Abstract
Colour centres in single crystals are stable. The crystals can be stored in the dark for several months without any appreciable loss of colouration. The colouration of the microcrystalline powders, on the other hand, was found to decay very fast. This fast decay has been attributed to the defects inherent in the microcrystallites. The microcrystalline powders of the mixed crystals of KBr:KI could, surprisingly, retain their colouration for several days.
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