The DARKROOM COOKBOOK, Third Edition

312 THE DARKROOM COOKBOOK
Add 10.0 ml of Fixer Test Solution to 100.0 ml of used fi xer. Shake the solution. If nothing happens
or if a clear cloudiness appears the fi xer is okay. If a white, or yellow-white, precipitate is
formed the fi xer should be thrown out.
FORMULA #189
Hypo Clearing Agent
Water at 125F/52C, 750.0 ml
Sodium sulfi te, 200.0 g
*Sodium bisulfi te, 50.0 g
Water to make 1.0 liter
* The sodium bisulfi te lowers the pH in order to prevent softening of the fi lm emulsion. If paper is
to be used, the bisulfi te may be left out in order to improve the paper’s gloss.
Dilute 1:9. After fi xing rinse the print or fi lm for 1 minute in running water then transfer to
the HCA.
Water Rinse HCA (with Final Running
Papers After Fixer (optional) agitiation) Water Wash
SW 1 minute 2 minutes 10 minutes
DW 1 minute 3 minutes 20 minutes
Film 30 seconds 1 to 2 minutes 5 minutes
Capacity: Fifty 80 2 inch prints or forty 80 2 inches of fi lm per liter.
FORMULA #190
Kodak Amidol Redeveloper
Water at room temperature, 750.0 ml
Sodium sulfi te, 25.0 g
Amidol, 6.5 g
Water to make 1.0 liter
This developer can be used for redevelopment following the use of Kodak S-6 Stain Remover.
FORMULA #191
Kodak HT-1a
Residual Hypo Test
Small traces of hypo in fi lms or prints accelerate the rate of deterioration. It is diffi cult to test
for small quantities of hypo, but the following test will indicate when the fi lm or prints may
be considered reasonably free from hypo.