Scratchboard
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Scratchboard or scraperboard or scratch art is a form of direct engraving in which the artist scratches off dark ink to reveal a white or colored layer beneath. The technique uses sharp knives and too
Cross section of scratchboard. By removing the black ink with a sharp tool, the artist exposes the white clay.
Sunflower and Silver by Diana Lee
A detail of Sunflower and Silver to show scratching technique
Kaolinite
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Kaolinite is a clay mineral, with the chemical composition Al2Si2O54. It is a layered silicate mineral, with one "tetrahedral" sheet of silicate tetrahedra linked to one "octahedral" sheet of aluminat
Scratchboard
…beneath. The technique uses sharp knives and tools for engraving into the scratchboard, which is usually cardboard covered in a thin layer of white China clay coated with black India ink. Scratchboard can yield highly detailed, precise and evenly textured artwork. Works can be left black and white, or colored…
Kaolinite from Twiggs County in Georgia in USA
Kaolinite structure, showing the interlayer hydrogen bonds
Kaolin mine in Czech Republic
A kaolin processing plant