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Also, there is no guarantee that custom color palettes you create will work with future Tableau Desktop upgrades. Tableau doesn't test or support custom color palettes, so be sure to back up your workbooks before you continue. You can use a new palette like you would any other.

When you save the workbook and restart Tableau Desktop, the color palette names you added to Preferences.tps appear in the Select Color Palette drop-down list (Edit Color dialog). When you modify Preferences.tps to add colors, use the standard HTML format for the new colors (hexadecimal value #RRGGBB or Red Green Blue format). If you need to manually assign more than 20 colors to data items, you may want to create several custom palettes with 20 or fewer colors in each palette. Although there isn’t a limit to how many colors can be added to each custom palette, the Edit colors dialog box only shows 20 colors. You can add as many custom palettes as you like to your Preferences.tps file, each with as many colors as you want. For example, you can create a custom categorical palette that matches your company's brand. You can also create and use your own custom color palettes by modifying the Preferences.tps file that comes with Tableau Desktop.

Tableau Desktop comes with color palettes that have been carefully designed to work well together and effectively apply color to data in many situations, such as on maps, heatmaps, bar charts, etc.