Photographers' Formulary 0.5lbs Amidol Photo Film Developer

The Photographers' Formulary Amidol is for photo film developing. Note: Amidol is very soluble in water or sulfite though it deteriorates rapidly in solution. The keeping properties of amidol in solution can be improved by the addition of a weak acid, such as lactic acid. Amidol is energized by sodium sulfite alone, without the necessity of adding any alkali.