Abstract
THE study of natural colouring matters is at once peculiarly fascinating and peculiarly difficult. The nature of the colouring matters in animals and plants, and even in some minerals (ruby, sapphire, emerald, and amethyst, for example) is still, in the majority of cases, not completely fathomed.
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Turacin: a Remarkable Animal Pigment Containing Copper1. Nature 48, 209–211 (1893). https://doi.org/10.1038/048209a0
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DOI: https://doi.org/10.1038/048209a0