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Re: Mix your own FO?
Nick , I will post the procedure later today. The 75ml should have been the
yield of ferric oxalate from a starting point of 50 g of ferrous ammonium
sulfate. And yes, the formula is for standard ferric. I have noticed however,
that my solution does give more print out than other ferrics, but it is not as
much as ammonium ferric oxalate.
EJ Neilsen
Nick Makris wrote:
> Eric, which one should have been 75ml?? Also, would you mind posting your
> procedure for making ferric oxalate?
> To avoid any confusion, I am refering to the #1 & #2 solutions used with the
> DOP processes and not AFO.
>
> Many thanks,
>
> Nick
>
> Eric wrote
>
> >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
--
Eric J. Neilsen
4101 Commerce Street, Suite #9
Dallas, TX 75226
214-827-8301
http://e.neilsen.home.att.net
http://www.ericneilsenphotography.com