Rack Plating
Rack plating is kind of like the alternative to barrel plating. If the metal is too heavy or too large, or even too small. An example of something rack plated is a  keyhole.
The rack is usually made out of copper, because it's very maluable and conducts electricity. The metal is clipped to the copper, then put into a electrolyte solution. It must be placed correctly, or elsec the metal might come out uneven.
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