Can white vinegar soak the Great Wall currency?

Copper coins, ancient copper coins. During the Spring and Autumn Period and the Warring States Period, with the development of commodity economy, the metal weighing currency that needs to be divided and identified in circulation gradually became unsuitable and was replaced by metal coins. Most ancient coins in China were cast in the form of copper alloy, and square hole coins (copper coins) were the most common ancient coins.

Vinegar bubble method. Wash the ancient coins, put them in a small dish, and pour a little vinegar until the coins are submerged. Take it out after 24 hours, brush off the residual rust with a small brush until the money lines are clear, then wash the vinegar with clear water and wipe it in the shade.