Synonym(s): 12-Phosphotungstic acid hydrate Formula: H3PO4 12WO3 xH2O Formula weight: 2880.20(anhy) CAS Number: 12501-23-4 UN Number: UN3260 Hazard Class: 8 Packing Group: III Harmonized Tariff Code:  2811.19 Hazard Statements: H314-H318 Causes severe skin burns and eye…

Phosphotungstic acid is used in histology as a component for staining of cell specimens. It is a common negative stain for viruses, nerves, polysaccharides, and other biological tissue materials for imaging by a transmission electron microscope.