I am writing some notes in which theorems, definitions, examples and exercises have lightly colored backgrounds. What colors does your subconsciousness assign to these? Is a theorem yellow, green, or blue? How about an exercise?
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You can find examples of colour-blind-friendly colour palettes. I suggest that you pick one of those.
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Do you know of a site that maps my colors to "what color blind people would see"?
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There are even tools that you can get to simulate different forms of colour blindness on actual designs (rather than just testing colour palettes). It's been a while since I did design work so I'm not sure what the popular ones are at the moment.
colororacle.org looks promising (I think I remember using it back in the day) - but there are probably ones where you can upload images to test.