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Rooskie91 , 5 months ago They’re based on color blindness tests. They work because the background and the numbers appear to be the same color, making the number indistinguishable from the background if you have that specific kind of color blindness. en.m.wikipedia.org/wiki/Ishihara_test
They’re based on color blindness tests. They work because the background and the numbers appear to be the same color, making the number indistinguishable from the background if you have that specific kind of color blindness.
en.m.wikipedia.org/wiki/Ishihara_test