Homebrew PCBs

On Sun, 10 Apr 2011 10:57:23 -0700 (PDT), you wrote:

>ok .. 17% peroxide .. 
>34 % muriatic acid ..
>mixed 3 : 1 ..
>never seen copper come off a board that fast .. ever .. 
>did it outdoors .. respirator .. goggles .. gloves .. 
>anyways.. should the solution be bubbling even AFTER I take the 
>board out ?? whats it mean .. I put more 3 % peroxide in it .. 
>calmed it down ..  is it safe? 

The peroxide is going to decompose and release oxygen, that's what you
see.  It will calm down in about 30 days to the point where it doesn't
want to do much.

Regenerate it by bubbling oxygen through it.  It eventually changes to
a different kind of etchant, takes longer, is  a bit more mild in
terms of action.

Nothing to worry about in the proportions you used.  

Harvey

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