Abstract
The colour tests with concentrated sulphuric acid, Erdmann's, Fröhde's, Mandelin's and Marquis' reagent applied to alkaloids (and related compounds) are given together with those found in the literature. Special attention is paid to the colour changes in relation to time.
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Dingjan, H.A., Dreyer-van der Glas, S.M. & Tjan, G.T. Colour tests for the identification of alkaloids (and related compounds). Pharmaceutisch Weekblad Scientific Edition 2, 445–467 (1980). https://doi.org/10.1007/BF02273053
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DOI: https://doi.org/10.1007/BF02273053