"velic acid, ethandic acid 200 g. (restoration of the Second World War) Used in the restoration of objects of the period of the Second World War to preserve paint and remove rust. For cleaning, a 5% solution of oxalic acid (50 grams per 1 liter) is used. Depending on the condition of the object - cleaning with oxalic acid lasts 20-40 minutes in a warm solution and up to 3 days in a cold solution. Most often used is a plastic container heated in a water bath. The ability of the waste solution of oxalic acid to react with time weakens. This depends on the amount of oxides removed by the solution.
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