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<p>[QUOTE=&quot;Electron John, post: 2617721, member: 84417&quot;]We make a lot of polished cross sections of all kinds of metals and materials at my lab when doing failure analyses.&nbsp; We use a process much like that which GDJMSP noted (i.e. flat polishing wheels covered with various pads of descending grit size down to nanosized alumina, rotating 90deg after each step to remove the last steps polish lines).&nbsp; This puts a mirror finish on the polished surface. But once that polish is complete we are very careful not to touch or wipe anything on that surface because it will create scratches.&nbsp; We spray the polished surface off with water and blow it off with air and that is it.&nbsp; Even the tiniest speck of sand (which all dust has in it) on a wiping cloth will scratch it like crazy and ruin an hours worth of work.&nbsp; &nbsp; </p><p>I imagine the guys in the mint don&#039;t have to time to polish the dies to the same level we do which is likely why you see so many scratched up dies.[/QUOTE]</p><p><br /></p>

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