Cleaning Tarnished Copper

Cleaning Tarnished Copper

C030/8065 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 50.6MB

Downloadable file size: 3.1MB

Price image Pricing

Please login to use the price calculator



Caption: Cleaning tarnished copper. A 1981-minted US penny (one cent) coin has been half-submerged into saturated citric acid in a Petri dish. After several hours, the coin was removed from the acid. Before 1982, US pennies were minted from brass (95% copper, 5% zinc). Brass coins tarnish or corrode over time. Tarnish appears as a dull, dense film on the surface. It protects the underlying metal from further corrosion. Tarnish consists of various oxides, sulphides, sulphates, etc. that form due to reactions with gases in the atmosphere as well as oils from human hands. A common way to clean copper (i.e. remove tarnish) is to treat it with an acid, as demonstrated here.

Release details: Model release not required. Property release not required.

Keywords: acid, brass, c6h8o7, chemical, chemistry, citric acid, cleaning, copper, cu, metal, one cent, patina, penny, reaction, tarnish

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.