Well, I keep mine in the white (not transparent) bottles it comes in, in the shed, so it's probably not getting much light if any.
--- In Homebrew_PCBs@yahoogroups.com, Slavko Kocjancic <eslavko@...> wrote:
>
> If you leave peroxide (3%) on sun for day or two it's unusable for
> etching. It must be stored in the dark place. In light it's disolve to
> Oxigen and pure water.
>
>
> Dne 10.7.2012 0:52, pie tda7000:
> > I had a slow etch problem last time I made a board.
> > I think the temperature was rather low (I was doing it on a winter evening) also my chemicals are rather old.
> >
> > After nothing much doing after 15 minutes or so, I poured boiling water into a dish and set my etching tub on top. Went like crazy after that.
> >
> >
> > --- In Homebrew_PCBs@yahoogroups.com, "leeleduc" <leeleduc@> wrote:
> >> I use this technique all the time. I can do a 2X4 inch, 1 ounce board in about 1.5 to 2 minutes.
> >> I use 1 Part 31% HCL and 2 Parts 3% H2O2. I make just enough etchant to cover the
> >> board about 1/8 to 1/4 inch and lightly brush the surface with a foam Paint
> >> brush. I etch at room temperature. Works very well for me. Make sure your chemicals are fresh, especially the peroxide.
> >>
> >> --- In Homebrew_PCBs@yahoogroups.com, "txtom2" <unknown2@> wrote:
> >>> I just mixed up some Muriatic Acid and Hydrogen Peroxide (1:2) and tried etching a very small piece of PC board (cleaned and with no mask)to see how long it takes to etch thru (room temp about 75 degrees F). I saw a change in surface color in a couple of minutes, but no etch thru after 15 minutes. I changed the ratio to 2:2 to increase the acid content and after 15 minutes, no further apparent progress.
> >>>
> >>> Can someone please tell me what I'm doing wrong ? About how long should it take to etch ??
> >>>
> >>> Thanks, Tom
> >>>
> >
> >
> >
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