I may not have all the specifics right - it was about 6 months ago but
I did add 50 mL of 30% HCl and then aerated. It stayed a dull green,
even after a week of aerating. 50 mL of 35% H2O2 brightened it to
emerald green and I was able to etch a board with it. Total volume
was 2L + 100 mL. I'm sure I was doing something wrong but I just
wanted to etch boards not fiddle f∗rt around with chemicals.
I love AP. Its clear, clean, fast, reliable and very easy to use.
Never had to fuss with it. It just works.
I still have 2.1 L of mystery etchant if some one wants it... heh heh heh
--- In
Homebrew_PCBs@yahoogroups.com, Adam Seychell <a_seychell@y...>
wrote:
> Are you sure you added enough acid ∗before∗ aerating ? How do you know
> what the acid concentration was after aerating ?
>
> I find it hard to believe it wouldn't oxidize in that time.
> I assume you are looking for the transparent green color to
determine if
> the bath regeneration was completed.
>
> Adam
>
> Phil wrote:
> > I tried to use CuCl over a period of 4 months. I was never able to
> > regenerate it using a bubbler - even left it running for a week once.
> > I added more acid but no regen. However, adding H2O2 made a huge
> > difference. My bubbles were fairly small so I think I was getting O2
> > into it. I suspect there is more to it than just pumping oxygen into
> > the solution.
> >
> > --- In Homebrew_PCBs@yahoogroups.com, "stan4312" <stanman@t...> wrote:
> >
> >>I'm attempting to bootstrap my first batch of CuCl as I type, so
> >>this page is fresh off my bookmarks:
> >>http://pacificsun.ca/~robert/pcb/cucl.htm Pretty good
> >>page on CuCl. Lots of precision chemistry.
> >>
> >>I thought he also had the following seat-of-the-pants advice: if it
> >>hasn't regenerated overnight, add more acid, but glancing back, I
> >>see it must have been from somewhere else.
> >>
> >>Stan
> >>
> >>--- In Homebrew_PCBs@yahoogroups.com, "johnwhitneyfiat"
> >><johnwhitneyfiat@y...> wrote:
> >>
> >>>I have been off the group for a while and I'm sure this was
> >>
> >>covered.
> >>
> >>>In the direction for making etchant from Hydrogen Peroxide and
> >>
> >>Muratic
> >>
> >>>Acid, it says that you can regenerate with a bubbler. How long
> >>
> >>does
> >>
> >>>this take? I know it will depend on the amount and the area that
> >>
> >>was
> >>
> >>>etched, but is there a rule of thumb to make it work. I do have to
> >>
> >>day
> >>
> >>>that I make a small bathch and it worked great on a sample board.
> >>>
> >>>John Whitney
> >>>Wis X 1/9
> >
> >
> >
> >
> >
> >
> > Be sure to visit the group home and check for new Links, Files,
and Photos:
> > http://groups.yahoo.com/group/Homebrew_PCBs
> >
> > If Files or Photos are running short of space, post them here:
> > http://groups.yahoo.com/group/Homebrew_PCBs_Archives/
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >