Tarnish
Tarnish
Tarnish (/ˈtɑːrnɪʃ/) is a thin layer that forms over certain metals, such as silver, copper, and aluminum, as their outermost layer undergoes a chemical reaction. This reaction is typically due to exposure to air or moisture, and results in a dull, discolored, or lusterless surface.
Etymology
The term "tarnish" originates from the Old French word "terniss-", a derivative of "terne" which means dull, dark, or sluggish. It was first used in English in the early 15th century.
Related Terms
- Corrosion: A natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, or sulfide.
- Oxidation: A chemical reaction that involves the moving of electrons from a substance to an oxidizing agent.
- Patina: A green or brown film on the surface of bronze or similar metals, produced by oxidation over a long period.
- Polish (substance): A substance used to make something smooth and shiny when rubbed in.
- Rust: A reddish- or yellowish-brown flaky coating of iron oxide that is formed on iron or steel by oxidation, especially in the presence of moisture.
See Also
External links
- Medical encyclopedia article on Tarnish
- Wikipedia's article - Tarnish
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