Frosting – An effect seen on the raised parts of a coin whereby the metal appears to be crystallized. This is applied to the recessed areas of the working die.
Frosted devices – Raised elements on coins struck with treated dies to impart a crystallized appearance.
The below image shows frosting applied to Liberty, the word LIBERTY, the date and the motto on a half ounce platinum bullion coin. Image courtesy of Heritage Auctions.
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