I think others have covered the bases pretty well. Until you stop doing etching, I don't see any reason to dispose of the HCl/H2O2 brew. Regenerate it with more H2O2 (or oxygen) and use again.
Donald.
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----- "Frank P" <
qz9090@...> wrote:
> Donald,
> Please see my responses below...
>
> > Most any hardware store should carry it. Big box stores need to
> deal in large volumes to keep the margins up -- try a local hardware.
>
> I called an old hardware store (now an Ace Hardware) in my area and
> they told me they carry muriatic acid in one quart containers!
> Thanks.
>
> > I'm not sure what you want the NaOH for. You can use that to
> neutralise FeCl when you want to dispose of it, but for CuCl, all you
> need is H2O2 (hydrogen peroxide) from the druggist (3%) or beauty
> supply (12%) is better.
>
> The muriatic acid/H2O2 solution is used for etching, is it not?
> If you can "re-charge" the etching solution by adding H2O2 whenever
> you get ready to etch a board (I think someone else said this), I
> guess you may not need the NaOH (Drano) to neutralize the solution for
> a while.
>
> Of course, that raises the question, when should I be disposing of my
> etching solution? How do I know it is "spent" and is no longer
> useful?
>
> For storage, I believe a glass bottle is best (taking great care in
> protecting the metal cap).
>
> Unless things change, it looks like I'm going to be using muriatic
> acid/H2O2 as an etching solution. Although, the 1:1 ratio stated by
> Mark seems a bit strong. I have to check on this....
>
>
>
>
>
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