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The old masters prepared the copper for painting first by rubbing it with fine pumice abrasive. The copper surface was then treated with garlic juice which is believed to improve adhesion of the paint. Finally a white or grey ground layer of oil paint was applied as a primer. After drying the copper panel was ready for the artist to begin painting.
Scratchboard or scraperboard or scratch art [1] is a form of direct engraving where the artist scratches off dark ink to reveal a white or colored layer 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 .
The artist might also apply paint with a palette knife, which is a flat metal blade. A palette knife may also be used to remove paint from the canvas when necessary. A variety of unconventional tools, such as rags, sponges, and cotton swabs, may be used to apply or remove paint. Some artists even paint with their fingers. Tubes of paint
Chemical coloring of metals is the process of changing the color of metal surfaces with different chemical solutions. The chemical coloring of metals can be split into three types: electroplating – coating the metal surface with another metal using electrolysis. patination – chemically reacting the metal surface to form a colored oxide or ...
A detail of a self-portrait by Rembrandt.Three scratches in the center reveal the reddish ground. In visual arts, the ground (sometimes called a primer) is a prepared surface that covers the support of the picture (e.g., a canvas or a panel) and underlies the actual painting (the colors are overlaid onto the ground).
Traditionally, metal sculpture meant bronze casts, which artisans produced using a mold made by the artist. Smith, however, made his sculptures from scratch, welding together pieces of steel and other metals with his torch, in much the same way that a painter applied paint to a canvas; his sculptures are almost always unique works.