Posted 08/15/2009 3:17 pm
IIRC, the way the dies are prepared, the die is sandblasted and then lapped on the flat surface that creates the fields, which is then polished to a mirror finish. This is how cameo contrast is acheived.
In more recent proof sets, you're nearly guaranteed a cameo on your coins because the dies are refinished/replaced more often than in prior years.
Before looking at the link,m I thought maybe the mint was using a different sandblast material or technique. Reports of striations in the frosted parts killed that theory. Striations are from polishing; perhaps a new polishing technique is used either after or before the sandblasting. Perhaps there's someone who knows more about this than me can elaborate and correct me if need be?
For the record, I don't like it
Bruce
In more recent proof sets, you're nearly guaranteed a cameo on your coins because the dies are refinished/replaced more often than in prior years.
Before looking at the link,m I thought maybe the mint was using a different sandblast material or technique. Reports of striations in the frosted parts killed that theory. Striations are from polishing; perhaps a new polishing technique is used either after or before the sandblasting. Perhaps there's someone who knows more about this than me can elaborate and correct me if need be?
For the record, I don't like it
Bruce
