Visual Mixing Guide: Exactly What Colors Blue and Green Make Across Every Ratio
Mixing paints behaves very differently from mixing light. On a digital monitor, combining blue light and green light operates through additive color theory, yielding bright, luminous cyan. Squeeze acrylic, oil, or watercolor paint onto a mixing board, however, and you enter subtractive color mixing. Pigments absorb certain light wavelengths and bounce others back to your retina.
Blue absorbs red and yellow wavelengths while reflecting blue. Green absorbs red wavelengths while reflecting green and yellow bands. When you combine them, the shared reflected spectrum narrows around the 490, 520 nanometer range. That narrow band represents the blue-green family. If either paint contains trace black, umber, or red pigments, light absorption increases and the resulting mixture darkens noticeably.
Purity dictates brightness. Mixing a cool primary blue like phthalo blue with a clean viridian green produces an intense, saturated turquoise. If you substitute ultramarine blue, which possesses natural red undertones, the red acts as a complementary spoiler against the green. The resulting mixture dulls into a slate teal or stormy oceanic navy.
