Yes i think the letters are shallow as well.
As for the imprint, it doesn't go off by cleaning it even with tissue. But, polishing the surface (with copper cleaner for example) makes it go away. That means, it's *very* thin.
I've been using AS then standard white goop. At first i thought that AS would 'etch' chemically the core picture into copper - through oxydation.
But i saw that with white goop as well.
Ah and i saw that under Alpha heatsinks as well... I had the imprint under my PAL 6035. It's even more noticeable on the Alpha 8045 with its strong 4-bolts mounting system.
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