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Secondary Colors

✨ The alchemy of mixes

Secondary colors are colors obtained by combining two primary colors in a particular color system. The exact set of secondary colors therefore depends on whether we are mixing light or physical pigments. In the additive RGB system used for screens and other sources of colored light, the primary colors are red, green, and blue. Combining red and green light produces yellow, green and blue produce cyan, and blue and red produce magenta.

These colors appear because the light reaching our eyes stimulates the cone cells in different combinations, and the brain interprets their signals as a particular color. With physical paints and many traditional art materials, the situation is different. In a commonly taught subtractive model using cyan, magenta, and yellow as primary colors, the secondary colors are red, green, and blue. In simpler traditional painting lessons, red, yellow, and blue are often called primary colors, with orange, green, and purple taught as their secondary colors.

This model is useful for learning basic color mixing, but it is not a complete description of how all pigments behave. Mixing physical pigments does not work like mixing colored light. A pigment absorbs some wavelengths and reflects others, so combining pigments generally causes more of the incoming light to be absorbed. As a result, mixtures often become darker or less saturated than the original colors. The final appearance depends on the pigments, their proportions, the material used, and the lighting.

On a screen, by contrast, adding more colored light generally increases the total amount of light reaching the eye. Understanding secondary colors therefore requires knowing which color system is being used. The familiar combinations of orange, green, and purple are valuable for early learning and artistic practice, while the RGB and cyan-magenta-yellow models provide a more precise explanation of light and color reproduction. Secondary colors are thus not universal properties of colors themselves; they are results of particular ways of combining light or materials.

💡 Did you know?

Did you know you can test this yourself with play dough or markers? If you take a red ball of dough and a yellow ball and knead them together, they don't remain spotted: they become a brand new orange ball! This is called subtractive synthesis because the pigments hold back part of the light.

Why is green a secondary color in painting? Because to create it, you must unite heat (yellow) and cold (blue). The result is a balanced color that reminds us of nature and helps our eyes rest. Green is the most present secondary color on our planet!

Purple is often considered the most mysterious secondary color. It combines the energy of red with the wisdom of blue. Since it is sometimes difficult to obtain perfectly by mixing paints, natural pigments like indigo are also used to give it more radiance.