Coins rust easily when they are wet, so they should be stored in a dry place. Therefore, it is best to put coins in sealed boxes, such as iron boxes of biscuits, to avoid entering the air, and do not open them easily unless there are special circumstances.

Method for removing rust of coins

1, heating mode

This method is mainly aimed at iron money with shallow corrosion. The main component of rust is ferrous oxide, and its molecular structure is relatively loose, and its adsorption with iron coins is far less firm than that of copper coins. Therefore, some iron coins can be rusted by using the principle of thermal expansion and cold contraction.

2. Acid bubble method

Wash the coins, put them in a small dish, and pour in vinegar until the coins are submerged. Take it out after 4 hours, brush off the residual rust with a small brush, then wash the vinegar with clear water and dry it in the shade. However, yellow marks may appear on the surface of coins after passing through vinegar, which will affect the appearance.

3, dry brush method

When copper rust or rust is attached shallowly, chemical means should be used as far as possible, and physical methods can be used to make the money line clear. The specific method is to choose a large oil painting pen. First, fix the coins to be brushed on the glass plate, hold the root of the oil painting pen and brush evenly. Pay attention to the force, otherwise the effect will be poor, and then wash it with clean water.