Ponceau 3R (
C.I. 16155) is an
azo dye
Azo dyes are organic compounds bearing the functional group R−N=N−R′, in which R and R′ are usually aryl and substituted aryl groups. They are a commercially important family of azo compounds, i.e. compounds containing the C-N=N ...
that once was used as a red
food colorant.
[{{cite journal, title=A Global Perspective on the History, Use, and Identification of Synthetic Food Dyes, author1=Sharma, Vinita, author2=McKone, Harold T., author3=Markow, Peter G., journal=Journal of Chemical Education, year=2011, volume=88, issue=1, pages=24–28, doi=10.1021/ed100545v, bibcode=2011JChEd..88...24S] It is one of a family of
Ponceau (French for "poppy-colored") dyes.
References
Food colorings
Azo dyes
Organic sodium salts
Naphthalenesulfonates
2-Naphthols