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Preparing the Edges of an Etching Plate
When one prepares to do an etching, the plate must first be made ready. The edges of the plate must be beveled. This is so that the sharp edges of the metal do not cut the press blankets when the plate is later printed. The edges may be beveled with a scraper or a file.
Burnishing the edges of an Etching Plate
After the edges and corners are beveled, they must be burnished smooth and prepared for polishing. The burnisher is a smooth sided tool with a curved tip. The curved tip allows one to focus its polishing action into a smaller area as it is used further toward its tip. Pressure is applied as the burnisher is rubbed on the plate. The smooth steel is harder than the zinc plate and this rubbing action softens surface textures.
Before the plate is ready to etch, the plate must be polished. As etchings print the most subtle of details, any surface texture must be polished off in order to allow the highlights to stay bright. Remember the white areas in the final print are areas on the plate which have no texture and therefore hold no ink. To assure the greatest range of tonal value, one may polish the plate to an almost mirror finish. Here a polishing compound is being rubbed on the plate with a circular motion.
After the edges, corners and surface of the plate are prepared, the plate is ready to coat with a ground.
After the hard ground has been allowed to dry and harden, the line etch may begin. The drawing is done with an etching needle. Where the needle peels through the ground the plate is exposed. When the plate is immersed in a bath of acid, the exposed metal dissolves, creating valleys which later hold the ink during the printing process. The ground allows only the drawn lines to be exposed to the acid and protects the rest of the plate.
The word etching comes from a German word which means bitten. A corrosive is used to dissolve the plate in controlled ways. This plate is zinc and is etched with a nitric acid solution. Copper now is often etched using a less toxic ferric chloride salt solution. Different solutions for different metals.
Mineral spirits remove the hard ground after the etch. Note the lines now show up on the plate as they are actually little valleys in the zinc. An etching is a topography of texture. It is the texture of an etching which holds the ink and prints the image.
The plate has been cleaned and polished. A rosin dust has been melted onto the plate. Each rosin particle acts as a tiny acid resist. As the acid dissolves the plate around these particles it results in a field of tiny bumps. Each particle of rosin creates a little butte as the plate dissolves around it. The ink gathers between these microscopic bumps. This enables an area to print a continuous tone. The longer the plate etches, the deeper the texture -- holding more ink and printing a darker tone. Each different tone is etched a different length of time. This was the most time consuming part of creating this piece.
"Still Ragged After All These Years," is inked by hand in color. It is inked in the a la poupee technique. All the colors are on the plate when it goes through the press. It is printed from a single plate. Here I am inking it at the Washington International Print Fair.
When the inked plate has been cranked through the press the finished piece is peeled off the plate. More than the image has been transferred to the paper; the texture of the metal and all the topography of the plate is embossed into the hand pulled etching. This helps to give dimension to the piece and a crisp sharp focus that is one of the most attractive features of an original etching. Each piece is individually hand made.
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