FD&C Orange Number 1

FD&C Orange Number 1

Names
IUPAC name Sodium 4-[2-(4-oxonaphthalen-1-ylidene)hydrazin-1-yl]benzenesulfonate
Other names Acid orange 20 Orange I FD&C Orange Number 1
Identifiers
CAS Number	523-44-4 4-{2-[(1E)-1-ylidene]-1-yl}
Beilstein Reference	3826844
ChemSpider	7844542 4-{2-[(1E)-1-ylidene]-1-yl} 14466524 4-{2-[(1Z)-1-ylidene]-1-yl}
EC Number	208-346-6
Jmol interactive 3D	Image
PubChem	23666138 4-{2-[(1E)-1-ylidene]-1-yl} 23721617 4-{2-[(1Z)-1-ylidene]-1-yl}
RTECS number	DB7085000
InChI InChI=1S/C16H12N2O4S.Na/c19-16-10-9-15(13-3-1-2-4-14(13)16)18-17-11-5-7-12(8-6-11)23(20,21)22;/h1-10,17H,(H,20,21,22);/q;+1/p-1 Key: HMWJVUNISIEXFR-UHFFFAOYSA-M
SMILES [Na+].[O-]S(=O)(=O)C1=CC=C(NN=C2C=CC(=O)C3=C2C=CC=C3)C=C1
Properties
Chemical formula	C16H11N2NaO4S
Molar mass	350.32 g·mol^−1
Hazards
S-phrases	S22, S24/25
NFPA 704	0 0 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

FDA explanation of Orange Number 1

FD&C Orange Number 1 was one of the first water soluble dyes to be commercialized, and one of seven original food dyes allowed under the Pure Food and Drug Act of June 30, 1906.^[1] In the early 1950s, after several cases were reported of sickness in children who had eaten foods with excessive amounts of dye, the FDA conducted new, more thorough and rigorous testing on food dyes. Orange 1 was outlawed for food use in 1956.^[2]

References

1. "News of Food; U. S. May Outlaw Dyes Used to Tint Oranges and Other Foods". The New York Times. 1954-01-19. The use of artificial colors to make foods more attractive to the eye may be sharply curtailed by action of the United States Food and Drug Administration. Three of the most extensively used coal tar dyes are being considered for removal from the Government's list of colors certified as safe for internal and external use and consumption.
2. Maga, Joseph A.; Anthony T. Tu (1995). Food additive toxicology. CRC Press. p. 182. ISBN 0-8247-9245-9.