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<p>[QUOTE=&quot;mlov43, post: 3974117, member: 16729&quot;]I was just wondering about PAST practices at the U.S. Mint, since I am writing about developments at the Korean Mint in the 1970s to 1980s.&nbsp; They also transitioned around this time from pickleing to sandblasting (circa 1983~1985).&nbsp; The Koreans only started making frosted proofs in 1975.</p><p><br /></p><p>Also, the U.S. Mint, as well as other major mints around the world (Osaka, Britain, Austria, <i>La Zecca</i> in Italy, etc) were big influences on the Korean&#039;s mint operations.&nbsp; Which makes sense, since the Koreans were trying to learn from, and then compete with (and later take over!) the best of the best in the world.</p><p><br /></p><p>Nowadays, I&#039;m sure that lasers are also used to apply frosting, but their frosting looks different from that &quot;gritty&quot; looking laser treatment on that dime on the far right in your composite photo you uploaded.[/QUOTE]</p><p><br /></p>

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