The Complete Color Theory Guide: Exactly What Blue and Yellow Make Across Art and Physics

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Q1: Why do blue and yellow paint make green, but blue and yellow light make white?
Paint operates by subtractive mixing. The pigments absorb red and violet light, leaving only reflected green light. Stage or screen light operates by additive mixing. Yellow light already stimulates the eye's red and green receptors, so adding blue light stimulates all three color receptors, which the brain interprets as white.

Q2: Can you mix green paint back into pure blue and yellow?
No. Once physical pigments are blended, they form an irreversible mechanical mixture. Because the particles are intermingled at a microscopic level, you cannot extract or separate the individual yellow and blue pigment grains using standard artistic methods.

Q3: Why did my blue and yellow paint turn into brown instead of green?
This happens when one of your primary paints contains a third warm undertone. If your blue has red in it (like French ultramarine) or your yellow leans red (like cadmium yellow deep), you are effectively mixing red, yellow, and blue together. All three primaries combined absorb almost the entire visible spectrum, creating muddy brown or dark gray.