True. It will probably 'go off' faster than PMK.
Originally Posted by Jim Noel
If you were to use 150 ml of the Metol-ascorbic acid solution in glycerin described earlier in this thread in place of the Metol and Potassium Metabisulfite, dissolve 50 grams of Pyrogallol in enough TEA to make 850 ml, and add the two solutions together, you would have the single Pyro-Metol staining developer I mentioned. You could dilute it 25 or 50 to 1 for use, or perhaps more for stand development. 50:1 gives a working pH of ~9.5. I haven't thoroughly tested it yet. 1+50, 8 minutes, 70 F gave low contrast with Arista EDU 400 Ultra on VC paper, but there is detail in the shadows. I'm about to go back into the dungeon to try more magenta in the printing, and a longer development time for the film.
Originally Posted by Ian Grant
I am curious. I know the oxidation rate is much slower compared to PMK. Is there a difference in capacity? I haven't been able to read the article.
I haven't seen any capacity figures so just assumed it was similar to PMK. I just finished up some 5x7 TMY-2 and Efke 25, and 8x10 FP4+, J+C 100 and Efke 25 in the JOBO (not in an Expert tank). The TMY-2 did exceptionally well. The Efke 25 and J+C 100 were fine (practically the same as PMK except for a slight change in the color cast of the stain) but the FP4+ for some reason had some rotation direction micro fine density streaks that looked like virga from the clouds. I found that I generally had to reduce the recommended times (even though I shot the J+C 100 at 100). I think I will save the rest of my Max Pyro for the TMY-2.
The developing time for FP4+ in the above Pyro-Metol-C-TEA developer (call it PMC-TEA) is 10 minutes at 70 F. The attachment shows gradations, but not the fine grain.
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Gainer: You should be helping Ralph on his new edition! Great stuff about the developers. Even if some of us don't have the inclination to try your mixtures, your posts are very helpful and instructive. Thanks for taking the time and effort to help educate us. Very much appreciated on this end.
Originally Posted by gainer
How about this single solution Pyro+metol+ascorbic, the fundamentals of which were strongly inspired by Gainer? I mixed it up directly in TEA with a hot plat stirrer at about 150F.
TEA 85 ml
Ascorbic acid 2 g
Pyrogallol 5 g
Metol 1 g
TEA to make 100 ml
Mix chemicals in order listed. Will dissolve easily with a hot plate stirrer at about 150F.
Working Solution: 1:50 to 1:200
Starting point development time at 1:100 is 10-14 minutes with rotary (continuous) processing.
I have done some BTZS testing of the developer and will post a chart later after plotting the results.
The amount of total reducer in Pyro-Uno in a liter of working solution at 1:100 is about the same as that of Pyrocat at 1:1:100, and this should give good acutance.
Last edited by sanking; 07-25-2009 at 02:14 PM. Click to view previous post history.
Sandy: What is TEA? I assume, of course, that it is not drinking tea :}...any special concentration or componenets in the TEA?
I look forward to the BTZS data.
Originally Posted by Mahler_one
TEA is Triethanolamine. See http://en.wikipedia.org/wiki/Triethanolamine
Reducers mixed in TEA are very long lasting, and when mixed with water an alkaline solution of about 9.8 is formed that is fairly ideal for pyrogallol.
Gainer's PC-TEA is a one solution developer made up of phenidone + ascorebic acid in TEA. You just mix it with water for use.
I tried a similar approach using catechol, but TEA could not supply the pH of the Potassium carbonate solution. I haven't played with DEA (diethanolamine) yet, but Kodak did in HC-110. Don't mess with MEA. You can get a brochure that tells all you want to know about all three from Dow.com.