Scratchboard is a very unique medium created on a specially made board coated with a thin layer of fine clay. It's then painted or airbrushed with ink and the picture is made by scratching away the ink with a sharp blade or tool. For the color pieces, several layers of a diluted ink wash are added during the scratching process to build up color and contrast. Each piece takes anywhere from 50 to 400 hours to complete.
Watch this video and see how it's done
21 hours condensed to 3 minutes:
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