Cresol red

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A reddish-brown crystalline powder used as an acid-base indicator. Cresol red changes from yellow to red from pH 7.2 - 8.8.

Synonyms and Related Terms

o-cresol-sulfonphthalein; rosso cresolo (It.)

Chemical structure

Cresol red.jpg


  • Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in ethanol, water, dilute acid and dilute alkalis.

Composition C21H18O5S
CAS 1733-12-6
Melting Point 290 C (dec)
Molecular Weight mol. wt. = 382.42

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 2647
  • Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C21H18O5S, CAS= 1733-12-6

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