Acid orange 19

Acid orange 19
Names
	Other names Sodium 4-hydroxy-3-(2-(4-methyl-3-((phenylamino)sulfonyl)phenyl)diazenyl)-1-naphthalenesulfonate
Identifiers
CAS Number	3058-98-8;
3D model (JSmol)	Interactive image;
ChemSpider	4675590;
ECHA InfoCard	100.019.363
EC Number	221-298-0;
PubChem CID	135601373;
CompTox Dashboard (EPA)	DTXSID90883728;
	InChI InChI=1S/C23H19N3O6S2.Na/c1-15-11-12-17(13-21(15)33(28,29)26-16-7-3-2-4-8-16)24-25-20-14-22(34(30,31)32)18-9-5-6-10-19(18)23(20)27;/h2-14,26-27H,1H3,(H,30,31,32);/q;+1/p-1 Key: KKJOSHGDFRDDGD-UHFFFAOYSA-M;
	SMILES CC1=C(C=C(C=C1)N=NC2=C(C3=CC=CC=C3C(=C2)S(=O)(=O)[O-])O)S(=O)(=O)NC4=CC=CC=C4.[Na+];
Properties
Chemical formula	C23H18N3NaO6S2
Molar mass	519.52 g·mol−1
Hazards
	GHS labelling:
Hazard statements	H412
Precautionary statements	P273, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Acid orange 19 is an azo dye that is used to color polyamide and wool fibers. It is usually available as a fine reddish-orange powder. The dye is soluble in water, producing an orange solution. When this solution is treated with concentrated hydrochloric acid, it turns red.

Acid orange 19 is prepared by azo coupling with 1-Hydroxynaphthalene-4-sulfonic acid.

Like most azo dyes, it is mildly toxic when orally ingested and has carcinogenic properties.

References

↑ Hunger, Klaus; Mischke, Peter; Rieper, Wolfgang; Raue, Roderich; Kunde, Klaus; Engel, Aloys (2005). "Azo Dyes". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a03_245. ISBN 978-3-527-30673-2.
↑ "3058-98-8 | CAS DataBase". www.chemicalbook.com. Retrieved 2026-06-07.
↑ John, Arooba; Yang, Hsi-Hsien; Muhammad, Sohaib; Khan, Zafar Iqbal; Yu, Haiyang; Luqman, Muhammad; Tofail, Matiba; Hussain, Muhammad Iftikhar; Awan, Muhammad Umer Farooq (2022-07-13). "Cross Talk between Synthetic Food Colors (Azo Dyes), Oral Flora, and Cardiovascular Disorders". Applied Sciences. 12 (14): 7084. doi:10.3390/app12147084. ISSN 2076-3417.

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[Ullmann-1] Hunger, Klaus; Mischke, Peter; Rieper, Wolfgang; Raue, Roderich; Kunde, Klaus; Engel, Aloys (2005). "Azo Dyes". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a03_245. ISBN 978-3-527-30673-2.

[2] "3058-98-8 | CAS DataBase". www.chemicalbook.com. Retrieved 2026-06-07.

[3] John, Arooba; Yang, Hsi-Hsien; Muhammad, Sohaib; Khan, Zafar Iqbal; Yu, Haiyang; Luqman, Muhammad; Tofail, Matiba; Hussain, Muhammad Iftikhar; Awan, Muhammad Umer Farooq (2022-07-13). "Cross Talk between Synthetic Food Colors (Azo Dyes), Oral Flora, and Cardiovascular Disorders". Applied Sciences. 12 (14): 7084. doi:10.3390/app12147084. ISSN 2076-3417.