As a former university chemistry lecturer I would caution forum members about the care needed to specify the chemicals correctly. Since the second bath is sacrificial, a base should be chosen that is not complicated, or expensive. However, after reading the late Barry Thornton’s book, I tried his modified Stockler’s formula, which he developed for modern thin emulsion films. Visit Rob Archer’s homepage! Solution A ml distilled water at F, add 7. Sufficient exposure is essential. I try to start both baths at 70 F when I start development, but body heat t ransferred to the developer usually raises the temperature about 3 or 4 degrees by the time I am finished. Sorry if this has been covered before, but being a new member, I have not found any link to it here.
Sign In Sign Up. It piqued my latent interest in divided developers, so I read up on them a bit more and did some minor experimentation. Both types of two bath develpers will compensate for overexposed highlights. I made the mistake of constant agitation in both baths as I misread something! The gradation is better and the grain is just perfect. This brings up another issue; given continuous agitation in the first bath, a small volume of developer can be used, and it is not necessary to completely cover the reel. The Zone differences were determined using a spot meter.
In solution B the developing agent quickly exhausts itself in the high stoecker where the greatest density lies, while the low values continue to develop. I did hundreds of rolls.
Share this post Link to post Share on other sites. Anchell and Bill Troop. I tried double metol to compensate and results were better, but not to my satisfaction. So either the residual bath A is exhausted, or it is diluted to a level where it becomes ineffective over any reasonable time period.
The lack of popularity intrigues me. I actually favor using two bath developers with roll film and not sheet film. The time now is Thornton was chasing sharpness accutance and tonality.
Stöckler formula – Digitaltruth Photo
I don’t particularly care for any speed increase from a divided developer, not if it is going to compromise the quality of the negative. I don’t recommend it.
I etoeckler what was puzzling me was that two bath developers seem to have many fulm, but there are very few commercially produced two baths available. Sign In Sign Up. However, the second bath must be of sufficient volume to completely cover the reel during the rest periods.
Perhaps Stoeckler suggested using the borax as tne buffered alkali rather than an un-buffered solution, to reduce the grain, his name then being associated with this re-working; Leitz just issuing this formula as an up-tp-date version of their original.
No agitation in the second bath, leaving you time to go and have a fag, if you are that way inclined.
By SusieDecember 17, in Darkroom. The Darkroom Cookbook 2nd Edition. The two-bath developer Diafine has a good write-up here: This is one reason I have just bought some raw chemicals and am about to start experimenting. Probably the simplest 2-bath developer to make and use. Lastly I would really like to use a divided developer in my Jobo so it would have to be somewhat compatible with a continuous agitation method of devlopment.
Thornton Two Bath Developer
The film emulsion should be saturated with Bath A at the start of the second phase. Diafine will have a more “normal” contrast up into the highlights then a more sudden hard shoulder with little ztoeckler in the top highlights. Sufficient exposure is essential. I have a ‘rose tint’ outlook on my photography when using my Leicas! Increasing the time in solution A raises overall density and contrast, whereas increasing the time in solution B will only raise shadow detail if the film is returned briefly to solution A first.
Faster films will need longer times in both baths – you may need to experiment a bit to find your ideal times.
Stockler’s 2-bath developer – Darkroom – Leica Forum
In this way, it behaves much like a one-shot developer. If you are making the formula up your self Make the second bath so you have to dilute it to use. But which divided developer to choose?
Posted December 18, Temperature insensitivity- Depending on the specific formula, temperature can be very important. Very rarely I have seen the monhydrate specified in formulae; from the above data g of the monohydrate are equivalent to g of the anhydrous form. Posted November 2, Of course, I’m speaking from within the tiny universe of photo.
If you don’t have sodium metaborate, use whatever you have. Borax, TEA, sodium metaborate, carbonates, and even hydroxides can be good choices for bases. AtlantaTerry Posted 6 years ago. Jay DeFehr 6 years ago. Solution B Dissolve ten grams Kodalk in ml distilled water at F. I happened to have the article, so I shared the formula and developing information with him.
The development of good exposure meters, especially center weighted ones, made negatives much more uniform than in the past, so a major advantage of 2-bath developers in handling varying exposures was no longer important. L’arbre de heron Flickr – Photo Sharing! I’m about to do some C41 development, which per standard means 3: Sorry if this has been covered before, but being a new member, I have not found any link to it here. Then add grams sodium sulfite and dissolve. Using the same tank, but inverting every 60 seconds after an initial 15 second inversion gave a maximum density of 1.
When shooting in the southwest during the day, contrast is extreme so I use pyro to help salvage some of the more contrasty situations.