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> I use the same solution and noticed heating doesnt help either. TheWhen I tried HCl and H2O2 it was very fast, with no heating.
> biggest improvement in time that I get with my board came from sticking
> an aquarium air pump and with a hose with a bunch of holes that I did
> from a sewing needle into the solution. I get about 45 minute etch time
> now with my 1oz boards.