Chrysoine resorcinol

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"Gold yellow" redirects here. For the colour, see golden yellow.
Chrysoine resorcinol
Chrysoine resorcinol.svg
Identifiers
CAS number 547-57-9 YesY
PubChem 6093186
ChemSpider 21106427 YesY
EC number 208-924-8
Jmol-3D images Image 1
Image 2
Properties
Molecular formula C12H9N2NaO5S
Molar mass 316.27 g mol−1
Appearance Orange-yellow solid
Solubility in water 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 are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
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]