I use one part Muriatic Acid (cheap hydrochloric acid) from
Ace and two parts drugstore variety hydrogen peroxide. It
works extremely well. I only do small "hobby" jobs so
everything is rinsed down the drain when I'm finished.

Allen

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-
> bounces@mit.edu] On Behalf Of Marcel Duchamp
> Sent: Wednesday, June 05, 2013 5:09 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] differences between ferric chloride and
> sodium metasilicate PCB etchants?
>=20
> On 6/5/2013 1:47 PM, Perry Curling-Hope wrote:
> > Fastest, cleanest etching 'cut' is accomplished with
(Hydro)
> perchloric
> > acid.
> > This is dirt cheap and readily available, produced by
mixing
> pool acid
> > (HCl,, hydrochloric acid) with hydrogen peroxide, the so
> called '40 volume'
> > (12% H2O2, used as hair bleach and a
disinfectant/cleaner
> which is
> > available from a drug store) in appropriate proportions.
>=20
> What are the "appropriate proportions"?
>=20
> > Results have been so outstanding, I have not bothered
> with anything else.
> > Perchloric acid is quite safe to work with at these
dilutions.
> Which dilutions?
>=20
> > Do not leave the etching tray to dry out...dispose
> immediately after use
> >
> What happens if the tray dries out?
> What is the appropriate method of disposal?
>=20
> Thanks!
> --
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> archive
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