On Thu, 8 Jul 2004 08:55:52 +0100, "Leon Heller"
wrote:

I just put the plastic container with the etchant and PCB in a larger
container partly filled with boiling water. Etching usually takes about 5
minutes, with continuous agitation.

I find that faster etching = cleaner etching, too, with less risk of
the pen marks getting washed away and exposing areas you *don't* want
etched. Maybe there's a point where this rule breaks down, but I
haven't come across it yet and I use a microwave, too. I'm sure my
wife wouldn't approve, but since I don't have one, I can do as I damn
well please! :-
--

"What is now proved was once only imagin'd." - William Blake, 1793.