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Continue to ChatQuery : Figure 1: Ishihara colorblindedness test. I just answered a similar question, at some length: What's a good source of color palettes to provide to a color-blind user? The basic upshot https://vmapp.org/query/2867/Figure-1-Ishihara-Colorblindedness-Test-I-Just-Answered-A-Similar-Question-At-Some-Length-What-S-A-Good-Source-Of-Color-Palettes-To-Provide-To-A-Color-Blind-User-The-Basic-Upshot/