--- In
Homebrew_PCBs@yahoogroups.com, "Jim Tonne" <tonne@...> wrote:
>
>
> Harvey:
>
> I am merely a "lurker" on the group, slowly ramping up
> to do some etching.
>
> When you say "muriatic acid" what percentage (i.e.,
> strength)
> is it? Where do you buy it?
>
> And the H2O2 is simply the 4% stuff you get at the corner
> drugstore?
>
> - Jim Tonne W4ENE
>
>
I got mine at Cadman building supplies, I think it's 30% strength, at any rate it was under $10 for a gallon and works fine. I used 3% peroxide initially but now I use 40 volume (12%) I got from a beauty supply store. I add a capful of that to recharge the etchant when I don't feel like waiting for the air bubbling to do it.