A natural, colorless salt crystal found in some lake beds. Itis soluble in water and glycerin but not in alcohol. Whenmixed with water, it produces a slight alkaline reaction. Itsuse in photography was principally as a pH modifier ingold toning baths, but it was also used as a restrainer in pyrogallicacid developers and as an accelerator in hydroquinonedevelopers.
White cryst. powder
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