The DARKROOM COOKBOOK, Third Edition

FORMULA #197
Kodak TC-3
Stain Remover for Trays
SOLUTION A
Water, 750.0 ml
Potassium permanganate, 2.0 g
Sulfuric acid, concentrated, 4.0 ml
Water to make 1.0 liter
SOLUTION B
Water, 750.0 ml
Sodium bisulfi te, anhydrous, 30.0 g
Sodium sulfi te, 30.0 g
Water to make 1.0 liter
Formulas 317
To remove stains in trays from silver, silver sulfi de, and many dyes, pour a small quantity of
Solution A into the tray and allow to remain for a few minutes; rinse well and then replace
with a similar volume of Solution B. Agitate to clear the brown stain completely then wash
thoroughly.
Solutions A and B can be used for cleaning several trays but should be discarded after use.
An acid-fi xing bath may be used in place of Solution B, but it is important to wash thoroughly
to eliminate hypo from the tray and the hands.
NOTE: Store the solution in a stoppered glass bottle away from light.
Caution: Add the concentrated sulfuric acid slowly with constant stirring to the cold solution
of the permanganate.
FORMULA #198
Print Flattener
Glycerin, 60.0 ml
Water to make 1.0 liter
Immerse prints in this solution for not less than 5 minutes following washing and before drying
the prints.
Dampening the back of dried prints with a solution of 1 part glycerin to 3 parts of water
before placing them under pressure will also ensure fl atness and substantially eliminate their
tendency to curl.