Dennis;
Some of this was being posted as the Photo Engineering threads in Emulsion Making and Coating. Every time I start it kind of falters due to lack of interest. This is such specialized work that few are interested. So, someday the details will be gone, and just the basic formulas will be around such as I have posted or intend to include in the book. The actual details of the stuff you ask are so "way out there" that only a couple of people are interested.
When I started at EK, they gave us course after course in photochemistry, emulsion chemistry, system engineering and etc. to get to be good design engineers, and to give us a history of all of this stuff. The parts on B&W films were given in discussions with Dick Henn (Inventor of many of the developers and designer of some of the films) and Grant Haist who wrote his great 2 volume book. I've talked to and known Dick, Bill Lee (now both deceaased), Grant and many others who would be far better qualitifed to discuss things here but those still living chose to ignore APUG or merely lurk.
Thanks though.
PE
This might seem like a silly response, but...
If you want the look of 1970s Tri-X, Paul, perhaps simply cropping new Tri-X slightly will work.
If grain is finer and the image is sharper, slight cropping will reduce sharpness and increase grain. My guess is that gradation has improved along with these improvements, and will be commensurately reduced with cropping. If so, cropping (or alternatively using a slightly smaller format - e.g. half frame) might give you the equivalent of using 1970s film.
I realize that that will change perspective and such as well, but it might be the easiest answer.
Both are good. I mix my D-76 from scratch, but when I bought it, I bought Ilford's ID-11 in preference because it is sold in Canada in metric measurements, and Kodak sells D-76 here in US quart and gallon packages.
You should move to Québec, because I just bought a 1L packet of D-76...
So the gist of it is that if I buy a roll of 400 tri-x today, I will be able to get the same results as a photographer would in the early 70s, with some darkroom tweaks, right?
Hi !
I've read, in a book written by Mr Eaton IIRC, that D76 has changed many times because the original formula gained activity upon storage.
....
...If you had a lab soup your film, it was likely to be done in a mature replenishment line which gave subtle results which were, and are, impossible to reproduce in a home darkroom.
I'm so glad to see you posting again Don!
Well guys, that's all very fine and dandy, and very kind of you, but how do I go about those special qualities of replenished developer in my paterson 2-reel tank?
I'm so glad to see you posting again Don!
Replenished D76 is one way, you can also take a look at this article: http://unblinkingeye.com/Articles/Harvey/harvey.html
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