Clayton F-76
Posted: Tue Jul 04, 2006 7:52 am
Problems with Clayton F-76
I have run into a problem with Clayton F-76. First off I am not a novice, but a retired professional. I switched to Claytons F-76 fromD-76 as I am not doing a large amount of personal work anymore. And D-76 becomes unstable when stored for long periods or over 3 to 4 weeks even in filled and stoppered bottles. I decanted a quart of F-76 into 16 -2 oz brown glass bottles fully stoppered. I have been getting very good results for the past 3 to 4 weeks and then disaster struck. I normally dilute F-76 1:15 to equal D-76 1:1 as the 1:9 times of FP4 are too short, with my city water which come in at 72.The other day my roll processed for 7 ½ minutes at 72 degrees came out grossly underdeveloped. The first thing I did was checkout the camera, a Bronica SQ, battery and shutter speeds were all in working order..
I know the drill, back to calibration tests of the film and developer.. My question is two part. Has anyone else experienced a sudden loss of activity with Claytons F-76 with normal storage? And two does any one know of a method of testing a developer concentrate before committing a days worth of shooting to development?
I have run into a problem with Clayton F-76. First off I am not a novice, but a retired professional. I switched to Claytons F-76 fromD-76 as I am not doing a large amount of personal work anymore. And D-76 becomes unstable when stored for long periods or over 3 to 4 weeks even in filled and stoppered bottles. I decanted a quart of F-76 into 16 -2 oz brown glass bottles fully stoppered. I have been getting very good results for the past 3 to 4 weeks and then disaster struck. I normally dilute F-76 1:15 to equal D-76 1:1 as the 1:9 times of FP4 are too short, with my city water which come in at 72.The other day my roll processed for 7 ½ minutes at 72 degrees came out grossly underdeveloped. The first thing I did was checkout the camera, a Bronica SQ, battery and shutter speeds were all in working order..
I know the drill, back to calibration tests of the film and developer.. My question is two part. Has anyone else experienced a sudden loss of activity with Claytons F-76 with normal storage? And two does any one know of a method of testing a developer concentrate before committing a days worth of shooting to development?