pickling solution

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pick·ling so·lu·tion

(pikling sŏ-lūshŭn)
An acid bath used to remove impurities and oxidation products from metallic surfaces.
References in periodicals archive ?
The pickle is captured for reuse before high-pressure water is used to remove all traces of pickling solution.
Commercially, they dump this mix and repack in fresh pickling solution which gives it that nice "clear" look.
Amongst other materials, sugar beet scraps are used as a raw material for the production of environmentally-friendly, non-toxic pickling solutions for aluminium, steel and iron.