--- In
Homebrew_PCBs@yahoogroups.com, "nathan_h_tna" <nathan_h_tna@...> wrote:
>
> Which is safer to use and easiest to dispose of? i.e. which can I flush down the toilet ;-)
>
> I've used the Muriatic Acid / Peroxide solution for a couple of boards, but I'm really worried because I've read how dangerous it is to use. I'm making PCBs in my basement which is not well ventilated and I'm close to a gas furnace, so I'm worried that the fumes might ignite.
>
> I'm just looking for advice.. Thanks for your help.
>
I've recently switched to CuCL which starts out as acid and peroxide. So far I'm quite impressed, the stuff is certainly less messy, you can see the board as it etches without pulling it out.
As someone else said, the dissolved copper is the problem with disposal, it's highly toxic to marine life even in very dilute quantities. Either solution can be neutralized and/or evaporated and the solids disposed of in the trash.