Red Plus Green Paint Mixing Fact-Check: Light Physics Vs. Physical Pigment

Exploring the core elements of Red Plus Green Paint Mixing Fact-Check: Light Physics Vs. Physical Pigment—read on to discover the main takeaways.

In subtractive color mixing, combining pigments stacks absorption filters on top of one another. Red paint appears red because its chemical compounds absorb blue, green, and yellow wavelengths, reflecting primarily red light. Green paint appears green because it absorbs long red wavelengths and short violet wavelengths, reflecting middle-band green light back to the viewer.

When you blend red and green on a palette, the red pigment absorbs the green wavelengths, while the green pigment absorbs the red wavelengths. With the primary reflective pathways canceled out, the mixture absorbs the vast majority of the visible spectrum.

Because commercial paints are rarely pure, single-wavelength light filters, some scattered photons still reflect off the binder and filler minerals. This low-intensity, multi-wavelength reflection creates the color brown. If both colors are chemically pure complementary colors sitting directly opposite each other on a precise color wheel theory chart, the subtractive cancellation can produce a deep, neutral gray or near-black chromatic mass.