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quote:Originally posted by eric lA similar redox reaction is involved when you use oxalic acid to remove rust. In that case you reduce Fe(3) to Fe(2).
quote:Originally posted by eric lIt depends. If you want to remove rust stains from a piece of textile, an aqueous solution will do. It wil take some time soaking, overnight is what I do. But for removing rust stains from a metal object, I made a paste of oxalic acid with as little water as possible, and rubbed this paste over the stains, rinceing with clean water en drying afterwards.