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A third problem with the rainbow color map is that it is sensitive to deficiencies in vision. Roughly 5% of the population cannot distinguish between the red and green colors. Viewers with color deficiencies cannot distinguish many colors considered “far apart” in the rainbow color map. We provide this description of the problems with rainbow colors in the hopes that you do not use these color maps. Despite the well know problems with rainbow colors, they remain a popular choice. Relying on rainbow hues obfuscates data, which circumvents the entire process of data analysis that ParaView provides. Multiple perceptual studies have shown that subjects overestimate the effectiveness of rainbow colors. That is, people think they do better with rainbow colors when in fact they do worse. Don’t fall into this trap.