How to Clean a Penny Safely

Cleaning an old penny can remove oxidation, tarnish and surface buildup and reveal the metal underneath. But before cleaning any old coin—especially a 1943 steel penny—check whether it may have collectible value. Cleaning or polishing a valuable coin can reduce its numismatic value.

For ordinary, non-collectible pennies, Flitz Paste Polish can be used to remove oxidation and restore the surface. Before we get into how to clean a penny, it helps to understand why pennies from different years can react differently to cleaning.

The History of Penny Composition

The penny’s composition has actually changed over time. The original pennies that date back before 1837 were made of pure copper. At that time, the composition was changed to bronze. Bronze is primarily copper with 5% tin and zinc. In 1857, the US Mint wanted the penny to have a more white appearance. This is when the penny was made with a mixture of copper and nickel.

From 1864 until 1962, the penny was primarily made from bronze, although its composition changed temporarily during World War II. In 1943, most pennies were made from zinc-coated steel because copper was needed for the war effort. Most 1943 steel pennies are not particularly rare. However, a small number of 1943 cents were accidentally struck on bronze planchets left over from 1942. These rare 1943 bronze cents can be extremely valuable, which is one reason it's important to identify an old penny before cleaning or polishing it.

A simple magnet test can help distinguish a common 1943 steel penny from a rare 1943 bronze cent. A zinc-coated steel penny will stick to a magnet, while a bronze penny will not. If you have a 1943 penny that does not stick to a magnet, avoid cleaning or polishing it and consider having it professionally authenticated. Modern pennies have a different composition, consisting primarily of zinc with a thin copper plating.

How to Clean and Polish a Penny

For ordinary, non-collectible pennies, apply a small amount of Flitz Paste Polish rub to a soft microfiber cloth. Gently rub the surface of the penny to remove oxidation and buildup, then buff it with a clean, dry section of the cloth to restore the shine. 

Please note: If you have an old or rare coin that may have collectible value, do not clean or polish it before determining its value. Cleaning or polishing can create microscopic surface changes that may reduce a coin’s numismatic value. In some cases, the original patina and surface condition are important to collectors.

Flitz Paste Polish can remove oxidation, tarnish and surface discoloration from ordinary non-collectible coins while polishing the metal to restore its shine.

Important: Do not use Flitz Paste Polish on electroplated finishes. If you're unsure about a coin's composition, finish or collectible value, identify the coin before attempting to clean or polish it.