I obviously mentioned an earlier message re: using ascorbic acid with Pyro
PMK. I gather that this is done to reduce oxidation. I have questionsl
1. How much of ascorbic acid in grams is to be used per liter of solution?
2. With the use of ascorbic acid, how much developer (as measured in ccs
or ounces) is to be used per square inch of film surface?
3. Does the use of ascrobic acid eliminate the need to divide the developer?
Sandy King
>At 03:28 PM 1/27/98 -0700, Richard Sullivan wrote
>Previous stuff snipped..
>
>>Knoppow sas:
>>Right Dick. The stain factor goes way overboard. The idea is to give it
>>just enough vitamin C to bring the oxidation back in line with that which
>>you'd get with tray development. In the Jobo the stuff exhausts itself. I
>>think XTOL is nothing more than an MQ or PQ developer doped with Vitamin C
>>to cut the aerial oxidation factor. I'm gonna give it a go tommorrow in
>>fake Jobo. We could use rose hips instead, and make it big with the
>>back-to-nature crowd. The Gypsy Boots Mega Developer.
>>
>>--Dick Sullivan
>>
>>Bostick & Sullivan
>>PO Box 16639, Santa Fe
>>NM 87506
>>505-474-0890 FAX 505-474-2857
>><http://www.bostick-sullivan.com>http://www.bostick-sullivan.com
>>
>>
>>
> Xtol pretty clearly does not contain Hydroquinone. Ascorbic acid is
>itself a reducing agent. I find very little about it in the literature
>available to me. It was apparently used mostly for research work until
>recently. Xtol seems to be Phenidone and Iso-Ascorbic acid. Ilford Ilfosol
>seems to be an MQ developer with Ascorbic acid added. It would be
>interesting to know more about the function of the Acorbic acid in both
>devlopers.
>----
>Richard Knoppow
>Los Angeles,Ca.
>dickburk@ix.netcom.com