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A light tan, crystalline powder that reacts with metals to form stable salts. Benzotriazole is used in industry as a fixing agent in photographic emulsions, as an antitarnish agent for copper and its alloys, and as a corrosion inhibitor in antifreezes and water coolant systems. In 1967, it was used to prevent corrosion on bronze works of art as an additive in an acrylic resin formulation called Incralac (Madsen 1967). More recently benzotriazole has also been used as a Vapor phase corrosion inhibitor and as an additive in antitarnish cloths. Benzotriazole is also used as an antifoggant in photographic developers.

Synonyms and Related Terms

1,2,3-benzotriazole; 1H-benzotriazole; BTA; aziminobenzene; benzene azimide; benzisotriazole; Cobratec 99; 1,2-aminozophenylene;


MFA- Benzotriazole.jpg

Chemical structure



  • Moderately toxic by ingestion and inhalation.
  • Skin contact may cause irritation.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in ethanol, benzene, chloroform, dimethylformamide, toluene. Slightly soluble in water. Stable in acids and alkalis.

Vapor pressure = 0.04 @ 20C

Composition C6H6NHN2
CAS 95-14-7
Melting Point 98-100 C
Density 1.36 g/ml
Molecular Weight mol. wt.=119.12
Boiling Point 201-204 C

Resources and Citations

  • H.B.Madsen "A Preliminary Note on the Use of BTA for Stabilizing Bronze Objects" Studies in Conservation 12: 163-167, 1967.
  • C.Sease, "Benzotriazole: A Review for Conservators" Studies in Conservation 23:76-85, 1978.
  • H.B.Madsen "Further Remarks on the Use of Benzotriazole for Stabilizing Bronze Objects" Studies in Conservation 16:120-122, 1971
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: Entry # 1140
  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
  • Marie Svoboda, Conservation Survey Index, unpublished, 1997
  • Photographic chemicals: