Chrysoine resorcinol

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Chrysoine resorcinol
Chrysoine resorcinol.svg
CAS number 547-57-9 YesY
PubChem 6093186
ChemSpider 21106427 YesY
EC number 208-924-8
Jmol-3D images Image 1
Image 2
Molecular formula C12H9N2NaO5S
Molar mass 316.27 g mol−1
Appearance Orange-yellow solid
Solubility in water Partially soluble
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oil Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Chrysoine resorcinol is a synthetic azo dye which was formerly used as a food additive.[citation needed] In Europe, it was banned as a food additive in 1977.[1] In the US, it was banned in 1988.[citation needed]

Chrysoine resorcinol can be used as a pH indicator with a color change between pH 11 and pH 12.7. In colorimetry, it has an absorption maximum of 387 nm.

Chrysoine resorcinol (pH indicator)
below pH 11.0 above pH 12.7
11.0 12.7


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