Tropical hardening bath for films and plates, for use after development, at temperatures from 24°C to 35°C.
Is recommended to be used in conjunction with Kodak Tropical Developer DK15.
|Chromium(III) potassium sulfate (chrome alum)||30||grams|
|Sodium sulfate desiccated||60||grams|
|Water to make||1||liter|
|Mix chemicals in order.|
If crystalline sodium sulfate is preferred instead of desiccated sulfate, use 140 grams.
Agitate negatives for 30–45 seconds when they are first immersed, to avoid unevenness, and leave them for 3 minutes. After the equivalent of 20 10×8″ films per 4.7 liters been treated, the bath should be replaced, otherwise scum markings will result.
The freshly-made bath is violet-blue colour and keeps indefinitely while unused. A partially used bath deteriorates on standing for a few days, the colour changing to a yellow-green. The hardening bath should never be overworked.