How to remove rust from ancient copper coins? Thank you.

Soil rust is a mixture of soil and calcium magnesium salts, or a mixture of soil rust and copper rust. After unpacking the wrapping paper of the ancient coins, dry them in the shade indoors, then brush off the dirt on the ancient coins with a brush dipped in water and sink them into a basin of glacial acetic acid diluent (glacial acetic acid is a colorless and transparent acidic chemical solvent originally used in photographic darkrooms). Soak for an hour, touch the block of ancient money with a small stick and watch it spread out. Then put on medical rubber gloves. Hold the money in your left hand and brush it gently with your right hand until Qian Wen becomes clear. There is no need to wipe off the bronze rust on the back of ancient coins without inscriptions and inscriptions, so as to maintain some characteristics of unearthed ancient coins. After rust removal, put it into clean water to filter the solution, dry it with a soft towel or cloth, and lay it flat on old paper to dry. It used to be soaked in vinegar to remove rust. Most of this rust removal method takes a day and a night to dissolve the rust, which is very inefficient, but it can also be replaced in the absence of conditions.

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