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Fine etchant for glass

I am looking to create an almost invisible fine etch on the inside of a borosilicate glass vial, about 1 cm in diameter. I'd prefer to avoid nasty chemicals like hydrofluoric acid.
Would the commercial products, like Armour Etch or Etch Bath be too coarse? Any suggestions?

Craig Saltiel
researcher - Irvine, California, USA
February 3, 2011

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