Sometimes, I am truly amazed!
A pound box of Arm and Hammer Baking soda costs about a dollar-fifty in
any supermarket in the USA.
Cheaper at WalMart.
If you live in the high altitudes of Nepal or Tibet, and you have to
ride your yak down a mountainside to buy a box, then you might think
about saving
the cost of an ounce of bicarb.
Sorry.........I just could not resist.
Roland F. Harriston, P.D.
∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗
tda7000 wrote:
>
>
> Thanks - I guess then that just a water rinse isn't good enough?
> Also, do you re-use the baking soda mixture or make a new lot each time?
>
> --- In Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>, "leeleduc" <leeleduc@...> wrote:
> >
> >
> >
> >
> >
> >
> > One thing I should mention. I keep a bowl with about 1 quart of
> water and 1/4 cup of baking soda dissolved in it. When I'm done, I
> toss the foam brush and any tools I've used into the bowl to
> neutralize any acid on them. I do the same with the PCB, quick dip in
> the bowl and a quick rinse under the the tap and I'm good to go.
> >
> > --- In Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>, "tda7000" <Tda7000@> wrote:
> > >
> > > Sounds good, I think I will try that. Like the idea of a foam
> brush, should be easier to use than just a kitchen sponge and less messy.
> > >
> > >
> > > --- In Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>, "leeleduc" <leeleduc@> wrote:
> > > >
> > > > I use this technique all the time. I can do a 4X6 inch board in
> about 2 minutes. I use 1 Part 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.
> > > >
> > > > I've also tried 1 part HCL and 2 parts 12% H2O2 but the reaction
> was too fast and hot to control easily.
> > > >
> > > >
> > > >
> > > > --- In Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>, "tda7000" <Tda7000@> wrote:
> > > > >
> > > > > I see some people get very fast etch times with a sponge and
> ferric chloride...
> > > > >
> > > > > But has anyone tried that method with the HCl and H2O2
> solution, or the cupric chloride?
> > > > >
> > > > > Or anything else for that matter?
> > > > >
> > > >
> > >
> >
>
>
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