Lithographs are produced by drawing and/or painting onto the surface of a flat surface (limestone or, now, metal plates) with grease. The surface is then treated with various chemicals to stabilize the image. Once the image is stabilized, water is sponged onto the surface, and ink is rolled onto the image. The areas where the grease image is are the only areas that will accept the ink. Paper is then placed on the surface and run through the press. In most cases, each color requires a different stone or plate. Quite often 40 or more stones or plates are used. The surface of a lithograph has only the texture of the paper.
Serigraphs or screen prints are produced by creating a stencil on thin fabric (originally silk, now man-made fabric) that is stretched across a frame. These screens are then placed on the paper or any other surface to be printed on and a squeegee with ink is then pulled across the screen leaving ink on the paper where the stencil is open. A new screen is used for each color. As opposed to lithography, serigraphs can have texture, and quite often opaque inks are used thus giving the serigraph the feel of an original oil or acrylic painting. Quite often serigraphs are done on canvas for this effect.
2006-10-28 04:48:21
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