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Yellow needles or powder. Paranitroaniline is used in the colorimetric test for Lignin. The intensity of the color is proportional to the concentration of lignin in the sample.

  • Wood pulp - brick red to dark orange color
  • Mechanical pulp - orange
  • Bleached sulfite pulp - yellow

Synonyms and Related Terms

p-nitroaniline; 4-nitroaniline; 1-amino-4-nitrobenzene; para nitro anilina (Esp.)

Chemical structure



  • Highly toxic by skin absorption, ingestion and inhalation.
  • Combustible. Flash point = 199 C. Explosion risk.
  • Produces toxic fumes.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in ethanol, methanol, ether, benzene. Insoluble in water.

Composition NO2C6H4NH2
CAS 100-01-6
Melting Point - Density 1.437 g/ml
Molecular Weight 138.1
Boiling Point 332 C

Resources and Citations

  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 6681
  • Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989 Comment: Used in test for lignin