Peter W.. Rowe, wrote:
On Mon, 23 Aug 2004 20:44:10 -0700, in =F4=07=F4 "Lamedeer" lamedeer@a=
delphia.net
wrote:
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-------------snip--------------------
Citric acid. Can be food grade or industrial. used in much the same w=
ay as
sparex, either cold or warmed. considerably slower than sodium bisulph=
ate
pickles, but is reported to be quite effective even so, if one has some=
patience.
And unlike the sodium bisulphate, it's essentially non-toxic in all but=
the most
concentrated forms (be careful not to inhale the dry powder)

I use citric acid and, at least heated in a 'crock pot' it works fast=20
enough for my poor attempts at silver work, I'm never waiting for it. It=20
can be bought at ingredient suppliers and some candle/potpourri type=20
sites. Also for the baking industry - as 'sour salt'.


One reader at one point reported using vinegar and a bit of salt. I've=
not tried
that, but he/she said it seemed to work... Once you've used it to diss=
olve
soldering flux and oxides, you probably should not, when you're done w=
ith the
jewelry, use the waste pickle in your salad dressing...

I THINK the addtion of salt to vinegar yields a weak nitric acid. This=20
is widely used by enamelists and does seem to work well for them in=20
preparing copper and silver for base coats/whatever.

Carl
1 Lucky Texan



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