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Re: Mix your own FO?
Sorry folks, that should have been 75ml.
-----
> I find
> that it yields about 1.5 times the amount of ferrous ammonium sulfate
used. For
> example: if you use 50 g ferrous, you would expect to yield 100 ml of
ferric
> oxalate.
>
> It is also relatively quick. There is no rehydration or mixing from
powder,
> because you end up with liquid ferric. On the down side, it may contain
unknown
> compounds. They may not be bad or present a problem with making excellent
> prints. I have been doing it this way since early in 1994. B&S hasn't
seen a
> dollar for ferric since. I would suggest that you try it. The method
that
> Jeffrey has posted may be a bit more handling of messy by products than
you want
> to get into. Either way you go, you'll see that making ferric your self
can be
> rewarding and it is much cheaper than buying powder. You will also see
that a
> fix to "bad" ferric is at hand.
>
> Have fun. If you would like I'll send you a write up on how to make
ferric with
> Ferrous ammonium sulfate, and oxalic acid, and H2O2 - 35% .
>
> EJ Neilsen
>
> Nick Makris wrote:
>
> > Hello again,
> >
> > I'm about to start another iteration of PT/PD prints and have to order
some
> > chemicals. The question that arises is whether to mix your own Ferric
> > Oxalate or to buy it premixed such as that from B&S. I know what some
(one)
> > person would suggest - Jeffery says mix your own and learn from the
> > experience. What I need to know is what are the trade offs; example,
able
> > to mix smaller amounts than you can purchase otherwise; or, less
expensive;
> > or, what. Is it worth the trouble and how much trouble is it, after
you've
> > gotton the process down??????
> >
> > Many thanks for everyone's help - it's a great group.
> >
> > Nick
>
> --
> Eric J. Neilsen
> 4101 Commerce Street, Suite #9
> Dallas, TX 75226
> 214-827-8301
> http://e.neilsen.home.att.net
> http://www.ericneilsenphotography.com
>
>
>