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White crystalline powder used for the colorimetric detection of Chromium in metals, tanned Leather, and pigments (Odegaard et al 2000). Diphenylcarbazide gives a dark blue-violet positive reaction. Other metals, such as Cadmium, Mercury, Magnesium, Silver, Nickel, Tin, and Aluminum will also react with diphenylcarbazide.

Chemical structure


Synonyms and Related Terms

2,2'-diphenylcarbonic dihydrazide; 1,5-diphenylcarbazide; S-diphenylcarbazide; DPC


  • Degrades in light.
  • May be harmful by ingestion or inhalation.
  • Contact may cause irritation.
  • ThermoFisher: SDS

Physical and Chemical Properties

Slightly soluble in water. Soluble in hot alcohol, acetone, glacial acetic acid

Composition C33H14N4O
CAS 140-22-7
Melting Point 168-171 C
Molecular Weight mol. wt. = 242.27

Resources and Citations

  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 3333
  • N.Odegaard, S.Carroll, W.Zimmt, Material Characterization Tests for Objects of Art and Archaeology, Archetype Publications, London, 2000, p.44.