obviously having both red and green is a nope. would black, white, red, and blue work? or would blue/black be an issue
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in reply to @bethposting's post:
i kinda suspect there's a long tail of different kinds of colorblindness that'd foil just about any scheme you chose other than distinguishing with shapes or patterns
I'll defer to actual color-blind people on this site (of which I know there are several), but try searching for color pallets for data visualization. The field of data viz has put a lot of academic research into this problem, and the tool vendors actually incorporate it into the built-in pallets.
Apparently it's possible to use red and green if you know what you're doing! Like a bright red contrasted with a dark green. Conversely even with "good" colors, it's the specific hues that matter and let them be well-separated. So don't just go by coarse colors like "blue" and "green," find the specific RGB values in use.
Red, White, Black, and Yellow are already a thing in alchemy, and I think are associated with the elements already. As long as the red and yellow are different brightness, they should be distinguishable from each other. If you check the colors using colorblindness filters, you should be able to check if they're distinct yourself. For extra measure, you should use symbols too
