it turns green, and gets less transparent as it fills with copper. If it
gets saturated it actually will turn blue.
The first few board will be very slow. You can add more h202 to speed it up,
but this can cause some gassing.
my advice, get it nice and warm, and be patient. It does get faster as it
matures.
----- Original Message -----
From: "ballendo" <ballendo@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, March 23, 2004 5:43 PM
Subject: [Homebrew_PCBs] Re: muriatic and H2O2 -goods and bads ?
> Les,
>
> So the "cupric" part is coming from the 1st board being etched?
>
> I looked at the links section as suggested. Had seen all that before.
> (I remember thinking too much work compared to just buying the
> persulphate, and it was dark like FeCl.)
>
> What prompted my interest in this thread was the muriatic is clear,
> and the h202 is clear, (no mention of cupric at all) so I thought it
> was a clear process... Now I'm confused.
>
> If I use mostly HCL and a bit of H202, and put my board in, will it
> etch well? Will it stay clear?
>
> From what you've written above, I would think that the h202 is just a
> means to get oxygen into the HCL, so a bubbler/sparger and HCL is the
> ticket? (with the usual concerns about muriatic vapors)
>
> Thank you in advance for any clarification,
>
> Ballendo
>
>
> --- In Homebrew_PCBs@yahoogroups.com, Les Newell <les@l...> wrote:
> > This is actually cupric chloride etching. Once you have the etchant
> > started you don't even need the H2O2. Just bubbling air though it
> for a
> > couple of hours does the trick. Do a google search for cupric
> chloride
> > etchant.
> >
> > I use it and it works well. It does not stain like FeCl and doesn't
> > smell as bad either. The down sides are that it takes slightly
> longer to
> > etch and the etchant will only do a couple of boards before it
> needs
> > regenerating by bubbling air through it or adding H2O2.
> >
> > Les
> >
> >
> > ballendo wrote:
> > > In Homebrew_PCBs, Stefan Trethan <stefan_trethan@g...> wrote:
> > >
> > >>Get yourself some muratic acid and H2O2 and then etch the boards.
> > >
> > >
> > >
> > > This is new to me. Is there a reason it doesn't get mentioned
> more
> > > often? We talk about FECL and the two persulphates... But not
> this.
> > >
> > > What are it's good and bad points? Besides being really cheap and
> > > widely available<G>
> > >
> > > Thank you in advance,
> > >
> > > Ballendo
> > >
> > >
> > >
> > > Be sure to visit the group home and check for new Bookmarks and
> files:
> > > http://groups.yahoo.com/group/Homebrew_PCBs
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
>
>
>
> Be sure to visit the group home and check for new Bookmarks and files:
> http://groups.yahoo.com/group/Homebrew_PCBs
> Yahoo! Groups Links
>
>
>
>
>