{Microcosmic salt} (Chem.), a white crystalline substance
obtained by mixing solutions of sodium phosphate and
ammonium phosphate, and also called
{hydric-sodic-ammonic-phosphate}. It is a powerful flux,
and is used as a substitute for borax as a blowpipe
reagent in testing for the metallic oxides. Originally
obtained by the alchemists from human urine, and called
{sal microcosmicum}.