Homebrew PCBs

If you actually want to use air to regenerate it that could work. You
might have to fine some CuCl to add, it could take a long long time
otherwise.

I don't think many people are patient enough to use air regeneration,
concentrated H2O2 is such a nice quick fix.

ST


On Sat, Feb 13, 2010 at 10:47 PM, awakephd <a_wake@...> wrote:
> I am following up on a comment in an earlier thread, to the effect that starting with 2 parts drug store hydrogen peroxide + 1 part Muriatic acid, one cannot ever get to the point of having CuCl2. (BTW, please forgive & correct if I do not get the chemical formulas right. Chemistry was a LONG time ago!)
>
> I am concerned / disappointed, because I have been saving my used etchant, made from the above, thinking that I would eventually build a tank to bubble in air to regenerate it, etc. But now it sounds like I would do better to neutralize what I have and start over.
>
> 1) Is that right, or is there any way to use the used etchant I now have on hand?
>
> 2) What do I need to do to make up an etchant mix that WOULD serve as the base for CuCl2?
>
> Many thanks ...
>
> Andy
>
>
>