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Richard Mille

Not sure of the answer to your question either....

 

my base response, without any scientific justification, is that you can treat the ATZ material like steel.  Get a 'Sharpe' marker and the mark will be there even if you try and wash it off with soap and water.  Can it be polished out?  I would imagine so.  In other words, the porosity of the material is low meaning that any mark does not move far below the surface and remains superficial.


Andrew H

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