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
Names
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
Identifiers
547-57-9 YesY
ChemSpider 21106427 YesY
EC number 208-924-8
Jmol-3D images Image
Image
PubChem 6093186
Properties
C12H9N2NaO5S
Molar mass 316.27 g·mol−1
Appearance Orange-yellow solid
Partially soluble
Hazards
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 is 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


Notes[edit]

  1. ^ http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31976L0399:EN:HTML

External links[edit]