Abstract
I WAS much interested by the letter of Mr. T. Ward (NATURE, vol. iv. p. 68) describing the appearance of a blue colour when looking at white chalk marks on a black board while the sun was shining in the eyes, as I have frequently noticed a precisely complementary phenomenon.
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M'LEOD, H. Red and Blue. Nature 4, 122 (1871). https://doi.org/10.1038/004122a0
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DOI: https://doi.org/10.1038/004122a0
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