White or slightly yellow, hygroscopic granules,
rods, or powder. Very soluble in water and liquid ammonia, sparingly
soluble in methanol, ethanol, ether. Manufacture of diazo dyes,
nitroso compds, and in many other processes of manufacture of
organic chemicals; dyeing and printing textile fabrics; bleaching
flax, silk, and linen; photography. In meat curing, coloring and
preserving; in processing smoked chub. Also as reagent in analytical
chemistry.