Color combinations to avoid

This chart is the result of a frustrating search for a simple list of color combinations to avoid if you want to accommodate various forms of colorblindness. Each intersection below lists one of the conditions that could cause someone to confuse the colors at the intersection, but there could be more than one condition that affects a particular color combination. If you have a correction or know of other problematic color combinations, feel free to email me (rabdill@umn.edu) or, even better, submit a pull request.

	green
red	Deuteranomaly	red
brown	Protanopia	Deuteranopia	brown
blue	Tritanomaly	Protanopia		blue
gray				Deuteranomaly	gray
black		Protanopia				black
yellow	Protanopia	Deuteranomaly	Deuteranopia		Tritanopia		yellow
orange	Protanopia	Tritanopia	Protanopia					orange
violet				Deuteranomaly		Tritanopia	Tritanopia		violet
pink		Tritanomaly		Protanopia	Deuteranomaly		Tritanomaly

Sources:

• National Eye Institute, "Facts About Color Blindness"
• Colour Blind Awareness, "Types of Colour Blindness"

Palette generators

• Colormind
• ColorSpace
• Paletton
• Sessions College Color Calculator