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<p>[QUOTE=&quot;physics-fan3.14, post: 3973945, member: 19165&quot;]I&#039;m not sure how the Korean mint does/did things (I know that&#039;s your focus). </p><p><br /></p><p>The US mint used the nitric acid pickling method up until 1970. </p><p><br /></p><p>After that, they transitioned to the sandblasting method mentioned above. </p><p><br /></p><p>Today, all proof cameos are created by laser. They gradually transitioned series through the early 2010&#039;s. </p><p><br /></p><p>This is an image that brg5658 created to show the different textures produced by the various methods: </p><p><br /></p><p>[ATTACH=full]1045810[/ATTACH][/QUOTE]</p><p><br /></p>

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