> BTW another dumb question: Can etchant be heated in a microwave?
> I mean it does contain metal right?

I'd be reasonably confident (3 standard deviations) that you'd have no
problems.

Metal per se is NOT a good microwave absorber. Metal smelting actually
requires special absorbers which then transfer the thermal energy to the
metal. Problems with metal in microwave ovens usually arises from closed
conductive loops which couple RF energy. You can (and I have) use flattish
metal pie plates in microwaves with no problems. YMMV / Don't try this at
home if you don't know what you are doing / standard caveats apply  ... :-)


        RM

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