The primary colors that cannot be made by mixing other colors are traditionally red, yellow, and blue. These three colors are considered fundamental in the traditional color model because they cannot be created by mixing any other colors together. They serve as the base colors from which secondary and tertiary colors can be made by mixing in various combinations.
To directly answer the question: The primary color that cannot be made by mixing other colors is one of red, yellow, or blue according to traditional color theory.
