Neutral gray is achromatic and characterless but takes on a complementary tinge from any adjacent color

Neutral gray occupies the center of the color sphere and represents the equilibrium state of visual perception. It has no intrinsic character — it is ‘sterile’ and ‘mute’. When adjacent to any chromatic color, gray is immediately tinged with that color’s complementary: gray on red appears greenish-gray; gray on green appears reddish-gray; gray on violet appears yellowish-gray. This ‘vampire’ property makes gray a dangerous and useful element: it attenuates the force of strong colors while absorbing their character into itself. Delacroix hated gray for this reason. Practical use: (1) a neutral gray background will appear differently behind each hue used in a design; (2) gray can serve as a transparent buffer between colors that would otherwise clash; (3) achromatic grays in composition must be the right brilliance to remain neutral — a gray equal in brilliance to an adjacent color will be strongly tinged.

Examples

In Hydra: src(s0).color(0.5,0.5,0.5).blend(osc(10,0,0).color(0,0,1)) — the gray src will appear tinged with orange (complement of blue) where the oscillator activates. Always preview grays on black, not white, to see their true temperature.

Assessment

Predict the apparent color of a medium gray placed on: (a) pure orange, (b) violet, (c) yellow; explain why salesrooms where fabric colors are to be judged should be decorated in neutral gray; define when gray loses its achromatic character.