Chromium oxide hydrate

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Viridian

Description

A transparent, green gelatinous mass. Chromium oxide hydrate, commonly called Viridian, is used as a pigment, a tanning agent and as a mordant for textile dyeing.

Synonyms and Related Terms

viridian; transparent chrome oxide; Pigment Green 18; CI 77289; hidróxido de cromo (Esp.); hydroxyde de chrome (Fr.); idrossido di cromo (It.); hidróxido de crómio (Port.); chromic hydrate; chromic hydroxide; chromium hydroxide; chromium hydrate; Guignet's green; chromic oxide gel; hydrous chromic oxide

FTIR (MFA)

Viridian, chromium oxide green (bottle 405).TIF

Raman

ViridianUCL.jpg

Raman

Viridian632.jpg

SEM

F412sem.jpg

EDS

F412edsbw.jpg


Risks

  • Toxic by ingestion, inhalation and skin contact.
  • Suspected carcinogen.

Physical and Chemical Properties

  • Soluble in acid and alkali. Insoluble in water.
  • Decomposes to chromic oxide with heat.
Composition Cr(OH)3
Molecular Weight mol. wt. = 103.02

Resources and Citations

  • Reed Kay, The Painter's Guide To Studio Methods and Materials, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1983
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2281

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