Ack!  My mistake.  It's ammonium persulfate.  You are correct, it's
safer and more neutral.  Also supposed to be much faster than ferric
chloride.

Going back under my rock now.

Gustaf

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Rick C.
> Sent: Sunday, February 29, 2004 10:35 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE:] My first PCB production
>
>
> What is the correct topic for this discussion?
> I have adjusted it to [EE]
>
> I have never heard of ammonium perchlorate. I have heard of and
> use ammonium
> persulfate and sodium persulfate with excellent results. It is
> very safe. Its
> fumes are no where near as bad as ferric chloride and the spent
> solution is
> almost neutral and it does not stain and corrode everything it
> comes near and
> is easy to dispose of.
> Rick
>
> "Gustaf J. Barkstrom" wrote:
>
> > Oyvind,
> >
> > It is ammonium perchlorate.  Its fumes are nastier than ferric chloride
> > in my opinion.  But, it does allow one to see the etching
> process through
> > the liquid, unlike ferric chloride.  As always; ventilation,
> ventilation,
> > ventilation.  Oh, and safety googles of course.  Don't take
> your vision for
> > granted. :)
> >
> > Gustaf
> >
> > >
> > > What is the "Magic White powder" exactly?
> > >
> > > Oyvind
> >
> > --
>
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