Abstract
IN the discussion on this subject in NATURE I have not seen any mention of a phenomenon which I have now and then noticed of late years, but never before, nor have I seen it described anywhere. When I have been reading and have become sleepy, just as I was about to fall asleep portions of the print in patches in different parts of the page turned a brilliant red. It is impossible to make any exact observations on the subject, because the moment one rouses oneself to do that the printing resumes its ordinary black. I do not find that this phenomenon is affected by the amount of light in any way.
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BACKHOUSE, T. Subjective Colours. Nature 69, 489 (1904). https://doi.org/10.1038/069489e0
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DOI: https://doi.org/10.1038/069489e0
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