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Capacity of Stock D76 v Xtol
I like to work with stock rather than diluted developer but I'm having a problem believing that the number of films that can be put through 1 litre of Xtol is more than twice the number that can be put through the same quantity of D76.
According to Aschell & Troop the capacity of 1 litre of D76 is seven films '...if you choose to reuse D76 without replenishment, develop a maximum of 7 rolls per litre.' (The Film Developing Cookbook, p.43). However according to Kodak 'The capacity of the full-strength developer with normal, unreplenished processing is approximately 15 rolls of 135-36 or 120 film...' (Kodak Professional Xtol Developer, March 2008. J-109).
Any comments on the above, particularly from those who have tested the capacity of either developer, would be most welcome.
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Don't believe all of what you read in Anchell.
On the other hand, D-76 is so cheap why bother with trying to stretch it? One of the most common mistakes my students made through the years was trying to save money by pinching pennies on developer and fixer. Inevitably the developer will give poor results on the best image you have ever made.
Jim
[FONT=Comic Sans MS]Films NOT Dead - Just getting fixed![/FONT]
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According to Kodak datasheet, a roll of film, 35mm-36 or 120, can be processed with 8 oz of D-76 or 4 oz of XTOL before extension of processing time is required. As I understand it, XTOL is more active than D-76 whatever that means....
Develop, stop, fix.... wait.... where's my film?
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I suggest that Eastman Kodak supplies the correct data for its products.
X-Tol capacity, Kodak document J-109, page 2: 15 rolls/liter (135-36 or 120).
http://www.kodak.com/global/en/profe.../j109/j109.pdf (X-Tol)
D76 capacity, Kodak document J-78, pages 7 and 8: 120 rolls/gallon = 30 rolls/quart = approximately 30 rolls/liter.
http://www.kodak.com/global/en/profe...bs/j78/j78.pdf (D76)
Last edited by Ian C; 02-10-2013 at 11:12 AM. Click to view previous post history.
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Xtol has a far higher capacity because it doesn't contain Metol. the Bromide build up is the limiting factor with D76/ID-11. Ilford introduced Autophen a PQ variant of ID-11 as a commercial photo-finishing developer and it had a very much higher capacity.
Ilford suggest up to 10 films per litre (35mm 36ex or 120) per litre of unreplenished ID-11. If you use Xtol then replenishment is a far better option and it's simple even on a relatively small scale.
Ian
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 Originally Posted by lawrenceimpey
According to Aschell & Troop the capacity of 1 litre of D76 is seven films ...
When all else fails, follow the manufacturer's instructions. The manufacturer is going to know more about its product than the testinistas. That includes using the film at box speed.
I know that that fact really chaps the hides of the testinistas who pride themselves in claiming to know much more than they really know.
These comments are about testinistas in no way reflect on the OP nor on his well considered question. Instead those comments are directed at the test-it-all-know-it-all's who publish unfounded "facts" in the internet. 
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.
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Originally Posted by Sirius Glass
I know that that fact really chaps the hides of the testinistas who pride themselves in claiming to know much more than they really know.
These comments are about testinistas in no way reflect on the OP nor on his well considered question. Instead those comments are directed at the test-it-all-know-it-all's who publish unfounded "facts" in the internet.
Amen, Amen. Love your term testinistas!
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.
~Antoine de Saint-Exupery
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Originally Posted by Jim Noel
Don't believe all of what you read in Anchell.
On the other hand, D-76 is so cheap why bother with trying to stretch it? One of the most common mistakes my students made through the years was trying to save money by pinching pennies on developer and fixer. Inevitably the developer will give poor results on the best image you have ever made.
Jim
I have no intention of stretching it to the point of likely failure, thanks. I asked the question because I'm curious about finding the correct answer.
Last edited by lawrenceimpey; 02-10-2013 at 02:08 PM. Click to view previous post history.
Reason: Clarification
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Originally Posted by Ian C
One of us is misreading J78. On page 7 they give the 'useful capacity' in litres (in brackets) in the last column. According to them the number of films is 4, which seems rather conservative to me.
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Originally Posted by Ian Grant
Xtol has a far higher capacity because it doesn't contain Metol. the Bromide build up is the limiting factor with D76/ID-11. Ilford introduced Autophen a PQ variant of ID-11 as a commercial photo-finishing developer and it had a very much higher capacity.
Ilford suggest up to 10 films per litre (35mm 36ex or 120) per litre of unreplenished ID-11. If you use Xtol then replenishment is a far better option and it's simple even on a relatively small scale.
Ian
Many thanks, as far as I'm concerned that explains it. I might take it up to 10 for D76 (or even 11, if I'm feeling really wild).
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