Scratchboard or scraperboard is a form of direct engraving where the artist scratches off dark ink to reveal a white or coloured layer beneath. Scratchboard refers to both a fine-art medium and an illustrative technique using sharp knives and tools for engraving into a thin layer of white China clay that is coated with dark, often black India ink. There is also foil paper covered with black ink that, when scratched, exposes the shiny surface beneath. Scratchboard can be used to yield highly detailed, precise and evenly textured artwork. Works can be left black and white, or coloured. Wikipedia
How do you seal scratch art?
First, remove all loose dust and debris from the surface with a soft brush or cloth being careful not to scuff the surface. Spray with 2 -3 coats of fixative (as directed on the can) in low humidity, warmer temperatures and in a well-ventilated area. Then, you can frame your finished Scratchboard art without glass.
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