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Have you ever wondered what luster looks like?
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<p>[QUOTE="physics-fan3.14, post: 3336308, member: 19165"]Yes, it is a result of metal flow and thus die wear. It cannot really be "corrected" with polishing, however (I assume you mean die polishing performed at the mint). Die polish can "reset" the surface - a properly polished die will remove all of these grooves and return it to a mirrored surface (hence many of the prooflike coins of this era). Polishing (as in cleaning the coin) will remove these ridges and leave a lusterless, shiny ugly coin. </p><p><br /></p><p><br /></p><p><br /></p><p>Doug, I think what you are interpreting in that image may be an artifact from the imaging and not actually a misaligned die. [USER=77413]@RonSanderson[/USER] , are either of these struck from misaligned dies? </p><p><br /></p><p>I think the difference in pressure may explain some of the difference in luster, but it has been theorized that San Francisco used a lower striking pressure to prolong the life of their dies. There is a difference between the mints, and a San Fran coin usually cannot be directly compared to a Philly coin. </p><p><br /></p><p>I think another large part of the difference in luster here is the die state - coin B is from a very different die state than coin A, and is thus expected to have a different character of luster (I often describe A as "creamy" luster, while B is more satiny as you describe it.) The type of luster will change over the life of the die, as the metal continues to wear against the die.[/QUOTE]</p><p><br /></p>
[QUOTE="physics-fan3.14, post: 3336308, member: 19165"]Yes, it is a result of metal flow and thus die wear. It cannot really be "corrected" with polishing, however (I assume you mean die polishing performed at the mint). Die polish can "reset" the surface - a properly polished die will remove all of these grooves and return it to a mirrored surface (hence many of the prooflike coins of this era). Polishing (as in cleaning the coin) will remove these ridges and leave a lusterless, shiny ugly coin. Doug, I think what you are interpreting in that image may be an artifact from the imaging and not actually a misaligned die. [USER=77413]@RonSanderson[/USER] , are either of these struck from misaligned dies? I think the difference in pressure may explain some of the difference in luster, but it has been theorized that San Francisco used a lower striking pressure to prolong the life of their dies. There is a difference between the mints, and a San Fran coin usually cannot be directly compared to a Philly coin. I think another large part of the difference in luster here is the die state - coin B is from a very different die state than coin A, and is thus expected to have a different character of luster (I often describe A as "creamy" luster, while B is more satiny as you describe it.) The type of luster will change over the life of the die, as the metal continues to wear against the die.[/QUOTE]
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Have you ever wondered what luster looks like?
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