goemon Posted February 18, 2005 Share Posted February 18, 2005 I've been having a problem recently with Neopan 400 in 120. I tend toshoot it, pop it into Ziplock bags, put it in my freezer, and then letit thaw before processing. I process it in XTOL 1:1, not that thatshould matter much. The problem is, after developing, I look at the images with a 10xloupe and see some strange patterns in the emulsion that look kindalike a mosaic. I initially thought "perhaps I am not letting it thawlong enough?" and let one roll thaw for something like twelve hours,processed entirely at room temperature using room temperaturechemicals and with distilled wash water. No trouble. I tried again,long thaw, room temperature chemicals, tap water (which in my area isvery hard) at something close to room temperature, Photoflo, let hang,again no problem. Yesterday I let some of the stuff thaw for fourhours and had the problem again. So my questions are: a) is this pattern characteristic ofreticulation? b) is four hours really not enough to thaw this film in120? c) am I doing something dumb? I have not had this problem withany other film--FP4+, Delta 400, TMX, Acros. I'd test it in 35mm, butI don't have any and my usual dealer has been out of stock in 35mm fora while. Alternatively I suppose it's possible that I got a batch of the stuffthat's bad, but I'd like to ask the forum whether I'm barking up thewrong tree with this before I start developing entirely unshot rollsto see if there's a coating problem. Link to comment Share on other sites More sharing options...
__stu_evans Posted February 18, 2005 Share Posted February 18, 2005 Newly bought film, placed in the freezer, has a moisture level deemed safe by the maker - likely so low the mechanics of freezing are moot. When you freeze an opened roll you introduce an unknown level of moisture to the gel which, after freezing, has every right to look like your windshield on an icy morning. That you get away with sometimes is irrelevant. Link to comment Share on other sites More sharing options...
silent1 Posted February 18, 2005 Share Posted February 18, 2005 Four hours should be plenty of time for the core of the roll to come up to room temperature -- I can thaw a pound of hamburger on the counter in that time. However, it's possible the gelatin continues to change state for a considerable time even after the temperature stabilizes, and that, if anything, would be the prime candidate for what you're seeing in rolls that haven't been out of the freezer long enough. Simple solution: don't freeze your exposed film. It won't hurt it a bit to sit at room temperature for a few days, or even for a few weeks, before you process it. I recently had processed a roll of Kodak Max 400 (consumer color film) that had been in my Spotmatic for more than four months, including storage inside a loaded vehicle parked in partial sun for three weeks in late summer and several more weeks of hot weather before the onset of autumn -- and it was perfect. I do freeze my film for long term storage (more than a couple months) prior to exposure, but I give it days to thaw, and then don't refreeze after exposure (typically no more than a couple weeks from exposure to processing). I do, however, freeze 35 mm that was bulk loaded, and haven't seen any of the problem you describe with my very long thaw in the sealed bag. Link to comment Share on other sites More sharing options...
goemon Posted February 18, 2005 Author Share Posted February 18, 2005 The main reason I started freezing it in the first place was I got called out of town and away from my darkroom for an extended period of time (many weeks); while I was out of town I shot a great deal of film and couldn't develop any of it. Insofar as this is likely to happen again in the summer, I'm somewhat concerned; I don't want the latent image to go away, but I don't want this mosaic crap either. I'll hold off on the newer stuff, at least. Link to comment Share on other sites More sharing options...
aki_dick Posted February 19, 2005 Share Posted February 19, 2005 I remember a thread in this forum maybe a year or two ago about high speed bw-film / pushed medium speed films where Lex wrote a long column about loss of shadow detail in undeveloped film within a month worth of about one zone compared to immediately developed films.<br>While he was refering to film speed of ASA 1600 and + you should not face any problems with fading images within a couple of weeks with Neopan 400 exposed at 400 or lower. I had some left in my camera up to almost half a year prior finishing the roll and developing without problems. Link to comment Share on other sites More sharing options...
lex_jenkins Posted February 19, 2005 Share Posted February 19, 2005 Aki remembers correctly. I noted a significant loss of shadow detail (what little there was) in a roll of TMY pushed to 1600 in which there was a month's delay between exposing the beginning and end of the roll before processing. Pushed film needs to be processed immediately. If I must delay I'll freeze the exposed roll. At the other extreme I exposed half a roll of Provia 100F normally, then left the camera in a drawer for a year. After I finished the roll I had it processed immediately. I couldn't see any difference between the beginning and end of the roll. Link to comment Share on other sites More sharing options...
jim kerr Posted February 20, 2005 Share Posted February 20, 2005 I've only had it to happen on one roll, it was a 120 roll and a good 25 years ago. I always thought it was that there was a variation in temparture of processing solutions,or maybe in the wash water temparture....Jim Link to comment Share on other sites More sharing options...
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