The HKS is a colour system which contains 120 spot colours and 3250 tones for coated and uncoated paper. HKS is an abbreviation of three German colour manufacturers: Hostmann-Steinberg Druckfarben, Kast + Ehinger Druckfarben, and H. Schmincke & Co.
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Tertiary colors are orange-red, orange-yellow, yellow-green, blue-green, blue-purple, and red-purple. Tertiary colors assume more of one color than the other.