In article , Jeff Layman
writes
I have always understood that the only chemicals which attack glass are
(1) hydrofluoric acid (2) strong alkalis.


No there's others. I have a small screen printing kit called Gocco and
you can get an add-on kit which basically allows the etch to go
throughout eh screen onto glass to etch it.

Janet
--
Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk