Trime - A U.S. coin with a face value of 3 cents minted in silver alloys from 1851-1873.
Tube - A plastic container designed for storing a roll or other quantity of coins of the same size.
Palladium and silver alloys are of higher quality than nickel and are sometimes not coated with rhodium. The purpose of plating is to add luster to grayer jewlery, as well as to prevent oxidation of some of the metals found in the alloys.
On the other hand copper-silver alloys can be of considerable hardness and have been used for jewellery dies in Iran etc in recent times. These were cast and then 'sharpened up' with an engraving tool.
Millesimal fineness is a system of denoting the purity of platinum, gold and silver alloys by parts per thousand of pure metal in the alloy.
For example, an alloy containing 75% gold is denoted as "750".
A U.S. coin with a face value of 3 cents minted in predominantly silver alloys from 1851-1873.
truncation
The sharply cutoff bottom edge of a portrait.
Kennedy half-dollar coins (1965-70) and proof Eisenhower dollars were struck from a clad metal of two different silver alloys that had outer layers of .800 fine silver and a core of .209 fine silver giving a net content of .400 fine silver.
 See also: Gold, Silver, Alloy, Coin, Coinage
  
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