Why Multi-Color Charts Are Colorblind Inaccessible

Many interfaces use charts to help users visualize data. But unfortunately, most of those charts are inaccessible to the colorblind. Colorblind users cannot differentiate the data marks if your chart uses multiple colors.

Below is a bar chart with different colored marks. Users with red-green color blindness (deuteranopia or protanopia) will have trouble distinguishing three of the four data series because the colors are too similar.

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