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The HKS is a colour system which contains 120 spot colours and 3520 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.
HKS colours, similar to Pantone colours, can be used in any kind of print publication to produce predictable colours. As in the Pantone colour system, there are HKS colours that cannot be reproduced using the CMYK colour space, like bright orange or certain tones of blue.
The HKS colour system is based on the euroscale colourspace. It follows the guidelines of ISO 12647:2 2002 and the FOGRA Standards (such as Fogra27L). This means HKS colours are available on all PaperTypes of the 12647. This makes it easier to print the colours in offset and common digital printing technologies.