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Old 13th April 2018, 09:13 AM
Chrisvclick Chrisvclick is offline
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Now that matches what i have here but suggests 1+4 as a maximum dilution... 1+14 would give a development time of around an hour for fp4 plus
Just for interest, i mixed 1+1 which i worked out to aprrox 14 mins for fp4 plus . I then allowed 50% increase for age. and its badly over developed leading me to think it might not have suffered much through age. Will try without the 50% next ...
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Old 13th April 2018, 09:40 AM
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As a rule of thumb I always start at standard dev with out of date film if it works all well and good. if not you have a starting point from which to increase the time.
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Old 13th April 2018, 01:12 PM
Martin Rick Martin Rick is offline
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Quote:
Originally Posted by Chrisvclick View Post
Now that matches what i have here but suggests 1+4 as a maximum dilution... 1+14 would give a development time of around an hour for fp4 plus
Just for interest, i mixed 1+1 which i worked out to aprrox 14 mins for fp4 plus . I then allowed 50% increase for age. and its badly over developed leading me to think it might not have suffered much through age. Will try without the 50% next ...
I can remember about that time Victor Blackman writing in AP about pushing HP5 to 1600 or maybe 3200 ASA using diluted Promicrol with a much extended developing time. It may have been an early reference to stand developing. The photo that accompanied it was some nerd jumping off the high board at an indoor pool, I recall.
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Old 14th April 2018, 09:15 PM
DavidMB DavidMB is offline
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Have pieced together the essential bits of an old Promicrol instruction sheet. I must have been mixing up the old and new versions. Normally used as stock or or diluted up to 1+6 - above 1+4 it said grain would increase. There were nomograms for temperature with stock and also one for dilution - 85cc needed per film. Will post a pdf of the bits of instructions in manuals section.

Failed in uploading pdf so link for now to my Google Drive - perhaps someone else can do the honours.

https://drive.google.com/open?id=1fq...f-Cm3yxyEfwDej

Last edited by DavidMB; 14th April 2018 at 09:32 PM.
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Old 15th April 2018, 05:12 PM
Chrisvclick Chrisvclick is offline
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Got a few pristine copies of the instruction sheet here .....
Just for info, fp4+ at iso 200, with 1+1 dilution about 12 to 15 minutes dependent on contrast required....

Well impressed....
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