For a lot of reasons, home etching ... acid dissociates into hydrogen and chloride ions: This is a pretty potent mix, with the oxygen radical and the chloride ions attacking the solid copper metal ...

The process starts with sanding down the bare brass and applying a layer of clear packing tape to the metal. [rasp] then ... as well for painting or chemical etching. With the LaserTape in place ...

The basic phosphatizing procedure involves the etching reaction and the surface coating formation. Subsequent to thorough de-greasing and rinsing of the metal work-pieces, the phosphoric acid ...

Mr. Lehrer and the firm's executive vice president, Robert Rossi, explained the process used in photo-etching metal parts. Mr. Lehrer showed a brass and gold-plated ornament designed for the ...