definition from the spruce
Coin Toning Definition:
Toned coins are result of a chemical process that reacts with the surface metal of a coin. Although any coin can tone, silver and copper coins are most susceptible to the toning process. Gold coins, on the other hand, are the least susceptible. However, gold coins can still take on subtle shades of toning as they get older.
Toning occurs naturally over time. It is mostly the result of oxygen and/or sulfur reacting with the coin's metal.
The toning process can be accelerated by heat and moisture.
Silver coins tend to tone in the most vivid colors. Colors can range in a variety of hues from brilliant blue to deep magenta, from vivid red to deep orange and a variety of shades of olive, green and gold. Additionally, toning can also turn ugly and occur in shades of black and brown. In the most severe cases the toning can turn into corrosion and cause permanent damage to the surface of the coin.
Coin Proof Definition:
Proof coins definition: Proof coinage means special early samples of a coin issue, historically made for checking the dies and for archival purposes, but nowadays often struck in greater numbers specially for coin collectors (numismatists).
Definition 2: A coin not intended for circulation but struck from a new, highly-polished die on a polished planchet and sometimes in a metal different from a coin of identical denomination struck for circulation.
Definition 2: A coin not intended for circulation but struck from a new, highly-polished die on a polished planchet and sometimes in a metal different from a coin of identical denomination struck for circulation.
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