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How to use colors in technical writing
Develop a color scheme instead of choosing colors randomly.
Colors should be used to call attention to the text, not to the colors themselves. Choose a small number of colors that look good together and document your choices in your technical publications style guide.
If necessary, you should also devote an introductory paragraph on the way color is used in your publications in the publications themselves, if your colors have been chosen to serve particular purposes, such as providing tips or warnings. Be consistent in your use of color.