Ammonium persulphate does not have a short shelf life (unless 2 years is
short) I had some that worked over 2 years, agreed the sq inches etched was
not excessive, maybe a100 or so with about gallon of solution, only last
year did I have to mix some more powder in (apron 3.5 years later)

Regards,

Kat.

----- Original Message -----
From: "Lawrence Lile" <llile@TOASTMASTER.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, July 16, 2001 9:19 PM
Subject: Re: [ee]: pc board traces got erased too?


> > Ammonium persulphate? Mouser sells it - I gather that once mixed shelf
> > life is short. How to properly dispose of it I don't know.
> >
>
> I believe it is OK just to dump it in the drain.  I think there was a long
> thread on this one time...
> Ferric chloride definitely does not belong in the city sewers, must be
> disposed of as haz waste.
>
> > Recent thread discussed rejuvenating ferric chloride by electroplating
> > out the Cu - I mentioned this to a chemically adept acquaintance, he
> > seems to think it's do-able.
> >
>
> Ya, it is possible, and also possible to produce a lot of hydrogen gas
> (boooom!).  Be careful.  Ferric chloride is really pretty cheap.  I think
> this possibility was considered in the long ambling thread on this
subject.
> Personnally, I don't see the need.
>
> > regards, Jack
> >
>
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