Re: gEDA-user: Disposing of Etch Solution

2011-01-20 Thread asomers
Yes, it's very easy to make H2O2 decompose. Activated carbon does it very quickly, but charcoal works too. Just don't use charcoal briquettes imbued with lighter fluid!. And if your sink is getting damaged, I would guess that the problem is too much base, not too much H2O2. Strong bases can etc

Re: gEDA-user: Disposing of Etch Solution

2011-01-20 Thread Mike Bushroe
I have excess muratic acid/hydrogen per oxcide etch solution after making a board. What is an acceptable way to dispose of it? The hydrogen peroxide is easy to neutralize; just put a piece of charcoal in the bottle and it should decompose. First pour water into

Re: gEDA-user: Disposing of Etch Solution

2011-01-20 Thread DJ Delorie
> Do you mean muriatic acid and hydrogen peroxide? Those are not > hazardous chemicals, Used etchant is *always* hazardous waste, because it contains copper, which is toxic. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-

Re: gEDA-user: Disposing of Etch Solution

2011-01-20 Thread DJ Delorie
The whole point of HCl/H2O2 solution is that you *dont* have to discard it. Over time, it grows into a CuCl etchant which is air regenerated and shelf stable. Otherwise, mix NaOH slowly until the solution turns from clear green to opaque white. Let the water evaporate, bring the remaining coppe

Re: gEDA-user: Disposing of Etch Solution

2011-01-20 Thread asomers
Do you mean muriatic acid and hydrogen peroxide? Those are not hazardous chemicals, if they are neutralized. The hydrogen peroxide is easy to neutralize; just put a piece of charcoal in the bottle and it should decompose. Exposing it to sunlight will also work. Muriatic acid could be harder, dep

gEDA-user: Disposing of Etch Solution

2011-01-20 Thread Rob Butts
I have excess muratic acid/hydrogen per oxcide etch solution after making a board. What is an acceptable way to dispose of it? Thanks ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user