Even though you may have to experiment a bit, development kinetics are
pseudo-first order
So time should be cut in half every 10C (18F). And luckily 68+18 = 86F
So by cutting development time in half you should be in the right ball park.
You could also cut the concentration of the developer in half and use
the 68F times, works for me with Rodinal and DDX
Marilyn wrote:
Hi All,
I need your help again, please.
Here in the southern California desert cold water coming from the
tap is sometimes 85 degrees. This is /hot/ for processing black and
white film and the times/temperatures on the back of the chemical
bottles only go up to the temperature of 75 degrees. Is there a
formula for figuring adjustments for processing film in warmer
water? I can cool water down by adding cold water >from a water
cooler, but I need such large amounts of water to process film, that
this becomes difficult.
Using bottled water causes temperature problems, too. Even at room
temperature the water is very warm.
And nooo - I can't switch to digital. I have students who want to
learn film and darkroom work (thank /heaven/ for these students{:->)
Marilyn
_________________________________________________
Let no one come to you without
leaving better and happier.
Mother Teresa
______________________________________________
--
Pablo Coronel Ph.D.
Researcher
Food Science Department
North Carolina State University
Room 14B Schaub Hall, Box 7624
Raleigh, NC, 27695
Phone (919) 513-3411
Fax (919) 515-7124
e-Fax (419) 818-7590
e-mail pcorone@xxxxxxxxxxxxxx
http://www4.ncsu.edu/~pcorone
