OF-1 (Ole's Fix numero uno)
About 1½ cup sodium thiosulfate
about two spoonfuls (heaped) of sodium sulfite
a dollop of sodium bicarbonate
three teaspoons ammonium chloride
in one liter water - or two.
Faster than TF-3, less smelly than TF-4, lots cheaper than both.
Exact measurements still to be determined.