Mgf2,caf2 cannot be removed using hf.   
    I just tested stripping.of ebeam deposited mgf2 using nitric acid 72 hours at   
   room temp it only pitted the coating.   
    I also tested straight sulfuric after 2 hours the parent glass substrate that   
   the mgf2 was deposited on etched (s-lah58) with no noticable effect on the   
   coating.   
   Master Optician REO   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)