Chrysoine resorcinol

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"Gold yellow" redirects here. For the colour, see golden yellow.
Chrysoine resorcinol
Skeletal formula of chrysoine resorcinol as a sodium salt
Space-filling model of chrysoine resorcinol as a sodium salt
IUPAC name
Sodium 4-[(2,4-dihydroxyphenyl)diazenyl]benzenesulfonate
Other names
Sodium p-(2,4-dihydroxyphenylazo)benzenesulfonate; Chrysoine; Resorcinol Yellow; Gold Yellow; Yellow T; Tropaeolin O; Tropaeolin R; C.I. Food Yellow 8; C.I. Acid Orange 6; C.I. 14270
547-57-9 YesY
ChemSpider 21106427 YesY
EC Number 208-924-8
Jmol interactive 3D Image
PubChem 6093186
Molar mass 316.26 g·mol−1
Appearance Orange-yellow solid
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 otherwise noted, 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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