Enlarged Negative
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:

Rodinal	5cc
Benzotriazole 0.2%	20cc
Potassium Iodide 0.1%	4cc
Water	1 liter