Earlier this week, Ryan Sleeper wrote a very informative post about improving the design of your data visualizations with your color choices. He touched on how straying from the built-in Tableau color palettes can give your dashboards a more custom feel, solidify the theme, and effect the appeal of the dashboard to your audience. But there is also another time that you should be cognizant of your color choices: when you need to make your dashboard accessible to folks who are colorblind. The U.S. National Library of Medicine estimates that 1 out of every 10 men have some form of color blindness. If you are using color to code important data, you should think about using color palettes that accessible to color blind people.