[pure-silver] Re: I say Ammonium you say Potassium

Yes, perhaps hygroscopic is a better term to describe
it.  At this point I see no reason to stray from the
classic pubs of the formula. =)
e
--- "Nicholas O. Lindan" <nolindan@xxxxxxxxxxxxx>
wrote:

> "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
> > I checked both the Kodak and Agfa versions of
> Nelson's. 
> > They are identical to the patent and call for
> Ammonium 
> > Persulfate.
> 
> Ammonium Persulfate (white powder, corrosive,
> hydroscopic) is used for 
> etching printed circuit boards.  I don't know if
> Radio Shack 
> still carries it.  Other electronic suppliers should
> have it.
> 
> Be sure not to get Ferric Chloride (foul, corrosive,
> brown)
> also used for PCB etching.
> 
> --
> Nicholas O. Lindan
> Cleveland Engineering Design, LLC
> Cleveland, Ohio 44121
> 
>
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