Just questioning the life of Pyrocat in trays and deep tanks and if it will hold up under floating lids. I would hate to throw out 2000ml just for 3 or 4 sheets of film. Any differences with the metol formula as to life expectency?
Pyrocat HD working life
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You asked this question at a very opportune time.
I just returned from a trip with some 50+ 5X7 negatives which I am developing using what I call extreme minimal agitation (four agitation cycles) using a very dilute solution (1:1:150). I place the film in open-ended PVC tubes, which are then transferred to a Beseler 11X14 print drum filled to over the top of the tubes, with the tubes standing on end of course. This takes about six liters of solution, which amounts to about 80ml of Stock A and B. Developing five tubes at a time I used this solution for five runs, or 25 sheets of film, increasing time of development about 5% for each run. The last batch of five sheets looks just as good as the first batch, with similar B+F. I could probably have used the solution for two or three more batches of five sheets each but just discarded it as I am through for the day. In any event I can say for certain that you can develop up to 25 sheets of 5X7 in six liters of 1:1:150 solution with very good results.
This is an extremely efficient method of development for small sheet film since you can work with the lights off from the time the tubes go in the drum and the lid goes on until you transfer the tubes to a tray of stop bath and fixer.
BTW, this development sessions was done over a period of about five hours. I don't have any direct experience with the metol forumula and this type of development, but unless someone proves otherwise I am inclined to believe it should work just as well as the phenidone formula. Exactly how long it would hold up in the open tank I don't know, but based on this session I would assume up to twelve hours with no problem.
Sandy
I just returned from a trip with some 50+ 5X7 negatives which I am developing using what I call extreme minimal agitation (four agitation cycles) using a very dilute solution (1:1:150). I place the film in open-ended PVC tubes, which are then transferred to a Beseler 11X14 print drum filled to over the top of the tubes, with the tubes standing on end of course. This takes about six liters of solution, which amounts to about 80ml of Stock A and B. Developing five tubes at a time I used this solution for five runs, or 25 sheets of film, increasing time of development about 5% for each run. The last batch of five sheets looks just as good as the first batch, with similar B+F. I could probably have used the solution for two or three more batches of five sheets each but just discarded it as I am through for the day. In any event I can say for certain that you can develop up to 25 sheets of 5X7 in six liters of 1:1:150 solution with very good results.
This is an extremely efficient method of development for small sheet film since you can work with the lights off from the time the tubes go in the drum and the lid goes on until you transfer the tubes to a tray of stop bath and fixer.
BTW, this development sessions was done over a period of about five hours. I don't have any direct experience with the metol forumula and this type of development, but unless someone proves otherwise I am inclined to believe it should work just as well as the phenidone formula. Exactly how long it would hold up in the open tank I don't know, but based on this session I would assume up to twelve hours with no problem.
Sandy
waynecrider said:
Yes, and I edited the message with the bit about the maximum length after I saw your comment. I agree that it is not a formula that should be carried overnight as there would also certainly be some increase in B+F.
Sandy
Sandy
jdef said:
Yea I was hopeing that it would last longer.
Sandy, what tubes are you using? Btw, did you ever complete a new tri-x film test?
Sandy, what tubes are you using? Btw, did you ever complete a new tri-x film test?
For this kind of development I am using open-ended PVC tubes because the specific gravity of this plastic is greater than water and the tubes sink to the bottom of the drum. ABS tubes float and this presents some complications in processing.
And yes, I have some tests of the new Tri-X, but only for rotary processing I believe, not for extreme minimal.
Sandy
And yes, I have some tests of the new Tri-X, but only for rotary processing I believe, not for extreme minimal.
Sandy
waynecrider said:
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pyrocat hd life
I have a stainless tank that holds 4 8x10 hangers, it takes two liters to fill. The tank has a lid that overlaps all the way round, and I can do semi stand like that with the lights on after the first bit.
Once I realized that you must lower the hangers VERY
slowly to avoid surge marks, all is well.
I have a stainless tank that holds 4 8x10 hangers, it takes two liters to fill. The tank has a lid that overlaps all the way round, and I can do semi stand like that with the lights on after the first bit.
Once I realized that you must lower the hangers VERY
slowly to avoid surge marks, all is well.
Herb,
Are you getting even development around the areas where the hangers clip on the film?
A couple of years ago there was a long disucssion on the best system for stand and semi-stand development and some people (not me because I have never developed this way) reporteded that the contact point between the hangers and film was a potential source of uneven development.
Sandy
Are you getting even development around the areas where the hangers clip on the film?
A couple of years ago there was a long disucssion on the best system for stand and semi-stand development and some people (not me because I have never developed this way) reporteded that the contact point between the hangers and film was a potential source of uneven development.
Sandy
herb said:
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