CAS - Molecule of the Week

Molecule of the Week
May 8, 2006

This molecule was originally selected on June 21, 2004

Regarding this week’s selected substance:

Orange B, a food color additive, is approved by the U.S. Food and Drug Administration, but only for use in hot dog and sausage casings, and only in concentrations less than 150 parts per million by weight in the finished food. Chemically speaking, Orange B is the disodium salt of 1-(4-sulfophenyl)-3-ethylcarboxy-4-(4-sulfonaphthylazo)-5-hydroxypyrazole.


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