Discussion
Chemical etching is a method for restoration of erased marks on
Answer: C
Chemical etching is a method for restoring erased marks, such as a stamped serial number, on metal. Stamping deforms the metal below the surface, and an etching reagent attacks the deformed metal faster than the rest, so the number shows again.
Wood, leather and plastic are handled by other means, such as heating or careful lighting, since a strong chemical etch is meant for the structure of metals. The method works on stamped numbers because the metal below the stamp is compressed and work-hardened, and this deformed zone reacts differently to the etchant than the surrounding metal, even after the number has been filed off.
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