Abstract
THE dyestuff ‘kernechtrot’ or nuclear fast red obtainable from G. T. Gurr, Ltd. (batch 3569), or T. Gerrard, Ltd. (nuclear fast red standard), has been found to be a sensitive reagent for the detection of calcium. In all instances the histochemical localizations of calcium indicated by the dyestuff have been confirmed by micro-incineration and microchemical tests. Mr. G. T. Gurr informs me that the manufacturers say that the nuclear fast red described here is an anthraquinone dyestuff, and the reactions with calcium salts parallel the reactions of other anthraquinone derivatives observed during a detailed study of histochemical methods for calcium which will be published elsewhere.
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