Acid Orange 7

Structural formula
General
Surname	Acid Orange 7
other names	Sodium 4 - [(2-hydroxy-1-naphthyl) diazenyl] benzenesulfonate ( IUPAC ); CI 15510; Tropaolin OOO2; Acid Orange A; Orange II; β-naphthol orange;
Molecular formula	C 16 H 11 N 2 NaO 4 S
Brief description	orange-colored, almost odorless solid
External identifiers / databases
EC number	211-199-0
ECHA InfoCard	100.010.182
PubChem	135442941
ChemSpider	21171709
Wikidata	Q4674081
properties
Molar mass	350.32 g mol −1
Physical state	firmly
density	1.6 g cm −3
Melting point	> 275 ° C
solubility	soluble in water (27 g l −1 at 20 ° C); soluble in ethanol; slightly soluble in chloroform;
safety instructions
GHS labeling of hazardous substances danger
H and P phrases	H: 372-412
	P: 260-264-270-273-314-501
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

CI Acid Orange 7 is an azo dye from the application group of acid dyes , which is used as a textile dye and indicator .

Manufacturing

Acid Orange 7 by diazotization of sulfanilic acid and subsequent azo coupling with 2-naphthol prepared.

use

Acid Orange 7 is used as a dye for dyeing wool, silk and cosmetics. The Scientific Committee on Consumer Safety (SCCS) of the European Union came to the conclusion in 2014 that Acid Orange 7 in non-oxidative hair colors up to a concentration of 0.5% posed no risk to the consumer. The available data were insufficient for assessing the safety of oxidative hair dyes and other cosmetics. It also serves as an indicator, as it shows a color change from amber to orange in the pH range from 7.4 to 8.6 and from orange to red in the range from pH 10.2 to 11.8.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f Entry on Orange II in the GESTIS substance database of the IFA , accessed on January 8, 2018(JavaScript required) .
^ ^A ^b ^c Gisbert Otterstätter: Coloring of foods, drugs, cosmetics . Behr's Verlag DE, 2007, ISBN 978-3-89947-958-4 , p. 203 ( limited preview in Google Book search).
^ Daniel M. Marmion: Handbook of US Colorants: Foods, Drugs, Cosmetics, and Medical Devices . John Wiley & Sons, 1991, ISBN 978-0-471-50074-2 , pp. 105 ( limited preview in Google Book search).
↑ Scientific Committee on Consumer Safety: Opinion on Acid Orange 7 COLIPA n ° C15 . 2014, ISBN 978-92-79-35658-2 , ISSN 1831-4767 , doi : 10.2772 / 48921 (English, europa.eu [PDF; 359 kB ; accessed on August 28, 2019]).
↑ Jürgen Falbe, Manfred Regitz: RÖMPP Lexikon Chemie, 10th edition, 1996-1999: Volume 4: M - Pk . Thieme, 2014, ISBN 978-3-13-200021-6 , pp. 2810 ( limited preview in Google Book search).

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f Entry on Orange II in the GESTIS substance database of the IFA , accessed on January 8, 2018(JavaScript required) .

[Otterstätter-2] A ^b ^c Gisbert Otterstätter: Coloring of foods, drugs, cosmetics . Behr's Verlag DE, 2007, ISBN 978-3-89947-958-4 , p. 203 ( limited preview in Google Book search).

[3] Daniel M. Marmion: Handbook of US Colorants: Foods, Drugs, Cosmetics, and Medical Devices . John Wiley & Sons, 1991, ISBN 978-0-471-50074-2 , pp. 105 ( limited preview in Google Book search).

[4] Scientific Committee on Consumer Safety: Opinion on Acid Orange 7 COLIPA n ° C15 . 2014, ISBN 978-92-79-35658-2 , ISSN 1831-4767 , doi : 10.2772 / 48921 (English, europa.eu [PDF; 359 kB ; accessed on August 28, 2019]).

[5] Jürgen Falbe, Manfred Regitz: RÖMPP Lexikon Chemie, 10th edition, 1996-1999: Volume 4: M - Pk . Thieme, 2014, ISBN 978-3-13-200021-6 , pp. 2810 ( limited preview in Google Book search).