Abstract
A NEUTRAL solution of visual purple exposed to bright light bleaches almost instantly to a deep orange colour, then more slowly to pale yellow. This transition has been believed to be wholly photochemical; the orange material a mixture of unbleached visual purple with the final yellow residue1. Both assumptions are mistaken: the orange photo-product is new pigment, which fades to yellow in complete darkness.
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WALD, G. Bleaching of Visual Purple in Solution. Nature 139, 587–588 (1937). https://doi.org/10.1038/139587a0
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DOI: https://doi.org/10.1038/139587a0
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