http://www.rense.com/general20/transparentalum.htm
Kinda like aluminum anodized all the way through; years ago some M.I.T.
guys brought the idea of hard anodizing to my grandfather's (big)
plating shop, where they developed the technique. At the time they
thought they might be able to eventually penetrate the whole piece with
resulting 70 Rockwell (?) oxide, but only got in .001 or so.....
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