Before I got my hands on AS3, I used ordinary stuff like titan silver grease and such, it left the imprint on the bottom of my block. Now with AS3, I also have the imprint, blotty but readable, think that happens when tightening the bolts on the block, it wriggles a bit.
Just tried a razor on my spare duron, and it 'snags' a little, but I just cannot see if the letters are raised or not. My guess is they are not, the precision of the small letters (esp. TM mark) is great, and if this is done by laser, laser evaporates the material and leaves sharp edges. Dunno if the edges are left something raised over the surface as a result of burning...
I just tried to smear some paint over the core and print it on the paper, but didn't have much success (prolly cos of the paint and the pressure applied), it leaves just a whole smear in rectangular shape of the core. Think that the letters are very shallow to leave the imprint with this method used...
I think that the letters are lower than core surface (laser engraved) and considering the pressure applied on the block and the temperature on the TIM joint, the letters just are baked onto the surface of the block (somewhat like in laser printers). The TIM joint is very very thin, and with high temp and pressure it just bakes the letters onto the base of the block. That's the reason (IMO) why the imprinted letters cannot be smeared by finger after removing the block, think they're baked in very thin layer onto the surface...
Dunno...:shrug:
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