The interwebs is full of examples (search for categorical color palette colour blind). But colorbrewer [1] is well known. And this [2] article "Color Universal

The interwebs is full of examples (search for categorical color palette colour blind). But colorbrewer [1] is well known. And this [2] article "Color Universal Design (CUD) - How to make figures and presentations that are friendly to Colorblind people" gives loads more information. [1] http://colorbrewer2.org/#type=qualitative&scheme=Paired&n=3 http://colorbrewer2.org/#type=qualitative&scheme=Paired&n=3 [2] http://jfly.uni-koeln.de/color/ http://jfly.uni-koeln.de/color/