Proof

The word proof can mean:

originally, a test assessing the validity or quality of something.
a rigorous, compelling argument, including:
- a logical argument or a mathematical proof (see also proof theory).
- a legal proof.
- a large accumulation of scientific evidence.
a photograph, print or page layout presented as an example for proofreading or approval.
alcoholic proof, a measure of how much ethanol is in an alcoholic beverage.
Proof, a play by David Auburn.
Proof, a film by Jocelyn Moorhouse.
Proof, a rapper and member of the group D12.

Proof Coins

a
Proof coin is a coin made as an example of a particular strike. Effectively it acts as 'proof' that the coin was struck. Preparation of a proof striking usually involved polishing of the dies, and an excertion of double the pressure to strike the coin.

Historically proof coins were only struck for this purpose, however nowadays they tend to be struck in greater numbers specially for coin collectors. They can usually be distinguished from normal circulation coins by their sharper rims and design, as well as much smoother fields. Modern proof coins are often treated with chemicals to make certain parts of the design take on a frosted appearance, and the fields taking on a mirror finish.

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