Etching is the technique of corroding away a design on metal using acid to create areas of varying depth below the surface. The acid is often referred to as a mordant. The process involves applying a resist to the metal to mask off certain areas, leaving the exposed metal to be eaten by the acid. Etching can produce a range of different effects that are dependent upon the type of resist and its method of application, the strength of the acid solution, and the careful timing of the etching process.

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