Thomas, you asked the other day for advice on "pulling" a roll of HP5+ at
ASA 100. Now that I'm home, I opened up my "The Film Developing Cookbook"
(written by Steven Achell and Bill Troop; it's a gold mine for all things
chemical that relate to B/W film) to see what was there.
Tetenal Ultrafin and Ilford ID-11 (essentially the same as D-76) are both
listed. Following are the development times for HP5+ in ID-11 at 68 deg.
F/20 deg C, 35mm film, intermittent small tank agitation, and a diffusion
type enalrger (condenser owners should increase the times by 200r so).
ASA dilution time (minutes)
400 straght 7.5
800 straight 10.5
1600 straight 14
400 1+1 13
800 1+1 16.5
1600 1+1 20
Following are the times given for Ultrafin, same conditions. This is all
that was in the book for this developer.
ASA dilution time (minutes)
400 1+10 7.5
800 1+10 10
400 1+20 16
As a starting point, I'd go with ID-11 and try extrapolating the 1+1
dilution times on a piece of graph paper to get a starting point for the
"pull" times. I'd shoot a test roll of a known-value target and use strips
of that roll to refine the curve a bit on either side of the "100 ASA'
figure, then go for it with the real McCoy.
Hope this helps. Let us know how it turns out!
regards,
Mahlon
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