Bromcresol green

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A reddish brown powder used as an acid-base indicator dye. In solution bromcresol green gives a yellow color below pH 3.8 and blue color above pH 5.4. It is used in the Archivist's Pen pH sensitive marker and in A-D indicator strips.

Synonyms and Related Terms

Bromkresolgrün (Deut.); bromocresol green; 3,3',5,5'-tetrabromophenol-meta-cresolsulfonphthalein; 4,4'-(3H-2, 1-benzoxathiol-3-ylidene) bis [2,6-dibromo-3 methylphenol]S,S-dioxide

Chemical structure

Bromocresol green.jpg


  • Ingestion, inhalation and contact may cause irritation.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in ethanol, ether, ethyl acetate, benzene. Slightly soluble in water.

Composition C21H14Br4O5S
CAS 76-60-8
Melting Point 218-219 C
Molecular Weight mol. wt. = 698.02

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 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 1407
  • Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C21H14Br4O5S, CAS= 76-60-8

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