Water, about 125F (50C) - 64 fl. oz. - 2.0L - 80 fl. oz.
Elon - 60 grains - 4.0g - 72 grains
Sodium Sulfite, desiccated - 10 oz. avdp. - 300.0g - 12 oz. avdp.
Hydroquinone - 520 grains - 36.0g - 624 grains
Sodium Carbonate, desiccated - 3 oz. avdp. 147.5 grains - 100.0g - 4 oz. avdp.
Potassium Bromide - 292 grains - 20.0g - 350 grains
Cold Water to Make - 1 U.S. gallon - 4.0L - 1 Imp. gallon

Metric measurements are exact. U.S. Customary measurements supplied. Imperial measurements accurate to within 1 grain, 2 grains on measurements 875 grains or larger in weight.