Good luck with the film trials Stoo. You should have asked me re where to stay in Portwrinkle. I would have given you a few addresses.
As for scary waves, I got very wet taking the shots in Portwrinkle. Worst one being chest height. I honestly thought I was going to lose the Blad and tripod - brown trousers/shorts was the order of the day. I just caught the tripod as it lifted off the rocks. After that I realised I had pushed it too far. I found it very difficult to judge when to retreat back up to the beach. Leave to early and lose out on great shots or risk soaking everything but get at least a shot or two in the bag. Either way I got thoroughly soaked every day for a week.
I would do it again tomorrow though - what a fantastic venue... As for Porth Nanven - I'm jealous, not got there yet.
It has to be one of the most interesting challenges in Cornwall. By the way, have you seen Andrew Nadolski's book - The End of Land. That's based on Porth Nanven. Wonderful colour neg based images (he uses Reala and Velvia I think)
Dan, thanks for taking time out to explain but the headache continues!
Originally Posted by dancqu
D-23 chemical make up ~ 7.5 gram Metol
100 gram Sodium Suplhite
Stoeckler 'A' Bath ~ 5 gram Metol
100 gram Sodium Sulphite
Thorntons 'A' Bath ~ 6.5 gram Metol
80 gram Sodium Sulphite
Now, I am assuming that By using the D23 alone, development would result in good negatives, assuming they were correctly exposed. But in Barry Thorntons book 'Edge of Darkness' he states, and I quote:
"Bath 'A' contains only the developing agent and preservative. The second, bath 'B' contains the alkali activator and any restrainer"
So, if that is the case, what is in the D-23 to activate the Metol? because Barry continues:
"The exposed film is first immersed in tank or dish, in Bath 'A'. Because there is no activator present virtually no development takes place"
O.k, I can see that there is more Metol in the D-23 than both Stoeckler and Thorntons formulas, but there is a lack of activator, hense the continuation of the development process is in need of a 'B' Bath , the activator, to yield a final correctly developed negative..
You see why I am confused!
How the bloody hell does the D-23 work? Beats the hell out of me!
Mark, thanks for pointing me in the direction of the photographer Andrew Nadolski. I looked him up. Some of his work can be found here:
The trip to Porth Nanven was well worth the extra miles. Very special. I am afraid that I did not come away from Portwrinkle with much as a sea fog moved in while I was there. If you ever go to Porth Nanven, ask how to get there as it is not the easiest place to find, even with an O.S in your lap.
Cheers Dan and Mark
Last edited by Stoo Batchelor; 01-31-2008 at 02:56 PM. Click to view previous post history.
Yet more headache! D-76H. Only 2.5 grams of metol. Barry, I'm
Originally Posted by Stoo Batchelor
sorry to say, has lead you into a state of confusion. Very simple.
Sodium sulfite is both preservative AND ACTIVATOR. In fact
sodium sulfite has a fairly high ph, round about 10. That is
higher than borax or bicarbonate.
So, metol and sodium sulfite in any reasonable proportion and
the correct amount of water will develope film, even paper.
It just so happens that Steve Anchell has addressed this issue
of development in the A bath of the above and other two bath
developers. In an article in Camera & Darkroom some years ago
he modified a few formulas so to include sodium bisulfite.
By so doing a lower ph and less A bath development.
For greater development control the A bath can be inactive.
Multiple passes twixt A and B baths are necessary. Dan
Actually Dan, no. no more headache. You have explained it perfectly well, and I couldn't thank you enough.
Originally Posted by dancqu
So the 'B' Bath, as Barry goes on to explain, is a final tweeking of what allready has taken place in bath 'A' And depending on what strength it is, will depend on the final contrast of the negative. Very interesting.
pH with sulfite
There has been more misunderstanding, lies, faith, and confusion about two bath/divided developers than the death of JFK.
Divided D-23 is the daddy of them all and seems to be Diafine (look at the MSDS.) D-23 has only the SS content to provide activation. Divided D-23 starts out as regular D-23 and as such, development does take place, but not a lot in 3 minutes. As you may know, you can extend the A development to change the film characteristics. The completion in Bath B is almost instantaneous, the 3 minutes is just for simplicity and marketing. However, it does provide a lot of "seed" sites for the sodium carbonate kick in the B bath.
Some extensive notes of mine from the early 90's has pH vs. SS concentration. To be honest, I can't remember if I got this info elsewhere, or it was the result of my own tests. Anyway:
30g/L of SS has a pH of about 8+
60g/L of SS has a pH of about 9
So, at 80-100 grams typical of most fine grain developers, you can expect a pH in the "low 9's." That's right there with D-76, +/- pH 9.2 - 9.5), which is right there with 10g/L of borax alone: pH 9.5.
In the next week I will be trying a two bath developer that I got from the original article on from a Shutterbug in 1992, by Otha Spencer. He claims "no grain" on a Plus-X, 35mm to 11x14. If you have an eye for such things, it's a concentrated DK-50 with the sulfite held about the same.
Metol, 6.5 g
SS, 32.5 g
HQ, 6.5 g
Pot. Bromide, 3 g
Water to make 1 Qt.
I think that there is an error on the B bath, stating "3 oz, 200 grains." That's about 91 grams! Even undiluted Dektol/D-72 doesn't use that much. You can't go too far wrong at at 5 grams, est. pH of 11.6. Or maybe 10 g Kodalk (sodium metaborate) for a pH of 10.5. With a two bath, you can try any accelerator in any amount as you wish, they are cheap chemicals.
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