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4-Nitrophenylhydrazine is a orange-red leaflet or needles wetted with water. 4-Nitrophenylhydrazine will emit toxic oxides of nitrogen when heated to decomposition. 4-Nitrophenylhydrazine is slightly heavier than water and insoluble in water
N 1907 (OTTO) 4-Nitro phenyl hydrazine, GR 99%+ Cas 100-16-3 - used as reagent for testing aldehydes and keto sugar.