Cleaning and Preservation of Coins - A Complete Guide, page 12

CHEMICAL COIN CLEANING with HYDROGEN PEROXIDE

(...CONTINUED from previous page)

Coin's Surface After Being Immersed for 2 Hours

Coin's Surface After 2-Hour Immersion

Coin's Surface After Being Immersed for 6 Hours

Coin's Surface After 6-Hour Immersion

This treatment also has a chemical effect on coins: not only the hydrogen peroxide react with the metal, but also accelerates the action of other impurities that can attack the coin metal.

This is how the coin looks like after the treatment; the upper neon-green area on the coin is the area that was not immersed into the solution.

Coin's Surface After Being Immersed for 12 Hours

Coin After 12 Hours of Immersion into Hydrogen Peroxide Bath

Coin's Appearance After Mineral Oil Was Applied to the Surface

Copper Coin Cleaned by Hydrogen Peroxide

Coin Before and After Cleaning

Copper Coin Before and After Cleaning



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