I like to use sheets of roofing copper for my photo intaglio plates. They are easy to cut to size on my old paper cutter and not too expensive. Besides, with photopolymer film, the plate can be reclaimed by soaking it in a strong soda ash solution and used again and again. Once I have my plate sized, I spritz the surface with water and sand it with very fine wet/dry sandpaper. When this is done, a quick rinse under running water and a spritz of isopropal alcohol to remove any traces of grease and I'm ready to apply the film.
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