"Sabretooth" Copper Foil Engraving Art Project from Royal & Langnickel. Ages & 8 Older. Scratchboard art is the easy way to create your own fantastic foil artwork. The design is created with silver lines preprinted on an engraving art board with a black background. Simply scrape away the lines and the design becomes a beautiful piece of copper foil artwork. Instructions and a practice piece is provided.