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A more reliable and helpful approach is to make sure that colors meant to convey information are augmented by some other indicator (symbols/shapes, text labels, line styles, etc.) whenever possible. In addition to avoiding colorblindness issues, this makes the difference easier to recognize in general. It also helps accommodate non-ideal viewing conditions such as a washed-out display, coordinating between displays that are calibrated differently, monochrome print/e-ink, and so on.