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Microcosmic salt

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sodium ammonium phosphate

–noun Chemistry.
a colorless, odorless, crystalline, water-soluble solid, NaNH4HPO4·4H2O, originally obtained from human urine: used as a blowpipe flux in testing metallic oxides.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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microcosmic salt  
n.  A white crystalline salt of phosphorus, HNaNH4PO4·4H2O, used in blowpipe analysis of minerals to test for the presence of certain metals.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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