Grey - in Color Theory

In Color Theory

Most grey pigments have a cool or warm cast to them, as the human eye can detect even a minute amount of saturation. Yellow, orange, and red create a "warm grey". Green, blue, and violet create a "cool grey". When there is no cast at all, it is referred to as "neutral grey", "achromatic grey" or simply "grey".

Warm grey Cool grey
Mixed with 6% yellow. Mixed with 6% blue.

Two colors are called complementary colors if grey is produced when they are combined additively. Grey is its own complement.

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