another use for the old timer, tones out of lith film:
mix two restrainers, potassium iodide, and benzotirazole to be added to the rodinal concetrate. cuts down on fog.
1 gram Potassium Iodide into 1 liter H2O makes the .1% solution. Likewise, 2 gram Benzotriazole into 1 liter H2O makes the .2% solution.. Here’s the formula:
20cc .2% Benzotriazole
4cc .1% Potassium Iodide