Homebrew PCBs

Jim Miller wrote:
> I know that placing metal in a microwave can produce "interesting" results.
> However is there any experience with a piece of copper in a cup of water?
> I'm speculating that the water may keep the copper from being the primary
> load on the microwave and also provide a cooling surface for the copper.
> 
> Just interested in heating a persulfate etching solution.

I usually strip the resist off a pcb while it's in 5mm of NaOH in a flat
tray, and the tray is in the microwave.