Microcosmic salt
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Microcosmic salt (stercorite; ammonium sodium hydrogenphosphate, (NH4)NaHPO4 is a salt found in urine. The first extraction of pure phosphorus came from this salt, when Henning Brandt attempted to extract gold from urine. It is used in the laboratory as an essential ingredient of the microcosmic salt bead test for identification of metallic radicles on the basis of the color they produce in oxidising or reducing flame, in hot or cold condition.
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