Methyl yellow

Methyl yellow
Methyl yellow
CAS number 60-11-7 YesY
PubChem 6053
ChemSpider 5829 YesY
EC number 200-455-7
RTECS number BX7350000
Jmol-3D images Image 1
Molecular formula C14H15N3
Molar mass 225.289 g.mol-1
Appearance Yellow crystals
Melting point

116 °C (decomp.)

Solubility in water 13.6 mg.l-1
log P 4.58
R-phrases R25, R40
S-phrases S36/37, S45
Main hazards Toxic (T)
NFPA 704
NFPA 704.svg
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Methyl yellow, or C.I. 11020, is a chemical compound which may be used as a pH indicator.

Methyl yellow (pH indicator)
below pH 2.9 above pH 4.0
2.9 4.0

In aqueous solution at low pH, methyl yellow appears red. Between pH 2.9 and 4.0, methyl yellow undergoes a transition, to become yellow above pH 4.0.

Additional indicators are listed in the article on pH indicators.

As "butter yellow" the agent had been used as a food additive before its toxicity was recognized (Opie EL)


  • NIOSH Pocket Guide to Chemical Hazards 0220
  • Eugene L. Opie. The Pathogenesis of Tumors of the Liver Produced by Butter Yellow. The Journal of Experimental Medicine, Vol 80, 231-246, 1944.

See also

Structurally similar compounds:

External links

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