"Jacob Christoph Le Blon, or Jakob Christoffel Le Blon, (2 May 1667 – 16 May 1741) was a painter and engraver from Frankfurt who invented the ...
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system of three- and four-colour printing, using an RYB color model which segued into the modern CMYK system. He used the mezzotint method to engrave three or four metal plates (one each per printing ink) to make prints with a wide range of colours. His methods helped form the foundation for modern colour printing." - (en.wikipedia.org 11.08.2021)
