Pickling (metal)

Pickling silver
Hard soldered silver rings placed in diluted sulfuric acid...
... to remove oxide and flux.

Pickling is a metal surface treatment used to remove impurities, such as stains, inorganic contaminants, and rust or scale from ferrous metals, copper, precious metals and aluminium alloys. A solution called pickle liquor, which usually contains acid, is used to remove the surface impurities. It is commonly used to descale or clean steel in various steelmaking processes.

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