Abstract
LIEBREICH1 pointed out that in a London exhibition of 1871 a painting showed roofs an oxen red on the sunny side but green where shadowed. He suggested that it indicated that the painter was a red–green colour vision defective. Angelucci2 called this “Liebreich's sign” when he described the works of six painters known to be red–green defectives, whose pictures showed this characteristic. Trevor-Roper3 and Kalmus4 also mention Liebreich's sign.
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References
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Trevor-Roper, P. D., Proc. Roy. Soc. Med., 52 (9), 721–744 (1959).
Kalmus, H., Diagnosis and Genetics of Defective Colour Vision, Ch. XIII, (Pergamon Press, London, 1965).
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PICKFORD, R. Liebreich's Sign for Defective Colour Vision among Artists. Nature 215, 542 (1967). https://doi.org/10.1038/215542a0
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DOI: https://doi.org/10.1038/215542a0
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