Which colors cannot be created by mixing other colors?

Primary colors are fundamental in color theory because they serve as the building blocks for creating a wide range of other colors. These are the colors that cannot be formed by mixing other colors together. In traditional color theory, the primary colors typically refer to red, blue, and yellow.

When exploring color mixing, secondary colors (created by blending two primary colors) and tertiary colors (produced by mixing a primary color with a secondary color) are built upon the foundation of primary colors. Neutral colors, like black, white, gray, and sometimes browns, can also be achieved through mixing but they do not serve as the basis for creating the wide color spectrum. Thus, primary colors are unique in allowing for the full palette of colors to be derived from them.