The DARKROOM COOKBOOK, Third Edition

The development times at 68F/20C are as follows:
Pyro Developers
Formulas 231
Unless otherwise specifi ed, mixing and development with pyro formulas should be carried
out between 65F/18C and 70F/21C.
FORMULA #49
510-Pyro (2006)
(Jay DeFehr)
Triethenalomine (TEA), 75.0 ml
Ascorbic acid 5.0 g
Pyrogallol 10.0 g
Phenidone 0.25 g
TEA to make 100.0 ml
The standard dilution is 1:100. Starting development time is 5 to 7 minutes at 70F/21C.
NOTE 1: Can be diluted up to 1:500 for extended development and reduced agitation techniques,
for increased edge effects. Use 1 minute initial agitation, followed by one inversion
every 10 to 15 minutes for up to one hour.
NOTE 2: TEA concentrates are easily measured with a measuring syringe. A 3.0, 6.0, or 25.0 ml
syringe will cover a wide range of dilutions and working solutions. Small variations in dilution
make no practical difference in the performance of the working solution.
FORMULA #50
Kodak D-1, ABC Pyro (circa 1890)
Film Time
Plus-X 7 minutes
Tri-X 35 mm 7 minutes
Tri-X 120 8 minutes
The formula is given here as three separate working dilutions, 1:1:1:7, 1:1:1:11, and 1:1:1:14.
For the traditional ABC stock solutions see Chapter 6: Pyrogallol and Pyrocatechin.