Comment on Dear Mr. Jobs, I have some ideas about how to improve your phoneparentComments−jacobolus17yEven monochromats can differentiate red from black, because the black is substantially darker. (Which isn't necessarily to say that adding other cues isn't also a good idea.)
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Even monochromats can differentiate red from black, because the black is substantially darker. (Which isn't necessarily to say that adding other cues isn't also a good idea.)