Chemical Etching
Etching, also known as chemical milling, is the process of using acids, bases or other chemicals to dissolve unwanted materials such as metals or semiconductor materials. This process has been used on a wide variety of metals with depths of metal removal as large as 12mm (0.5 in). Selective attacks by the chemical reagent on different areas of the work piece surfaces, is controlled by removable layers of material called masking, or by partial immersion in the reagent. » More Electroplating Terms | 
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