Homebrew PCBs

ok .. thanks Harvey .. 
Does it also change color when it calms down?
When I added more 3% peroxide .. it changed color..
and slowed down the etching process immensely.
Didnt seem like I added all that much either.. 


--- In Homebrew_PCBs@yahoogroups.com, Harvey White <madyn@...> wrote:
>
> 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
> 
> >
> >Randy
> >
> >
> >
> >------------------------------------
> >
> >Be sure to visit the group home and check for new Links, Files, and Photos:
> >http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> >
> >
> >
>