I think it was Carl who asked about info. from Billy Ward. Coincidentally, I
was looking for it as well at the same time. All I found was one old message
talking about etching with HCl and H2O2 in equal parts plus 8 parts water.
No mention of strengths. I can't find Billy's embryonic web page any more.
Some searching got a couple of useful sources:
Search on SM0VPO for detailed info., he recommends equal parts of 10%.
Spend an odd hour going through www.thinktink.com - more good stuff than you
can list, plus chemical supplies.
Steve
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