Acid Orange 6

Structural formula
General
Surname	Acid Orange 6
other names	Sodium 4 - [(2,4-dihydroxyphenyl) diazenyl] benzenesulfonate ( IUPAC ); CI Food Yellow 2; Resorcinol yellow; CI 13015 ( INCI ) ; E 103; Tropaolin O; C-yellow 9; Chryosin S (Free Acid) ;
Molecular formula	C 12 H 9 N 2 NaO 5 S;
Brief description	reddish yellow powder
External identifiers / databases
EC number	208-924-8
ECHA InfoCard	100.008.114
PubChem	2728027
ChemSpider	23622043
Wikidata	Q60479
properties
Molar mass	316.27 g mol −1
Physical state	firmly
solubility	soluble in water and ethanol
safety instructions
GHS labeling of hazardous substances	no GHS pictograms
	no GHS pictograms
H and P phrases	H: no H-phrases
	P: no P-phrases
Toxicological data	> 1000 mg kg −1 ( LD 50 , rat , oral )
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

CI Acid Orange 6 ( common name chrysoine resorcinol) is the sodium salt of 4 - [(2,4-dihydroxyphenyl) diazenyl] benzenesulfonic acid, a to the acid dyes counting azo dye . Thename Chryosin S is usedfor the free acid .

Chryosin S used to be approved as a food coloring with the E number 103. Acid Orange 6 is still used as a pH indicator , as it changes its color from yellow to orange in the pH range of 11.0–12.8.

The dye is one of the tropaeolin dyes.

Individual evidence

↑ Entry on CI 13015 in the CosIng database of the EU Commission, accessed on December 28, 2019.
↑ ^a ^b ^c ^d ^e ^f Entry on Tropaeolin O at TCI Europe, accessed on December 27, 2019.
↑ Shmuel Yannai: Dictionary of Food Compounds with CD-ROM: Additives, Flavors, and Ingredients . CRC Press, 2004, ISBN 1-58488-416-9 , pp. 353 ( limited preview in Google Book search).
↑ External identifiers of or database links to Chrysoine S : CAS number: 2050-34-2, EC number: 218-087-0, ECHA InfoCard: 100.016.444 , PubChem : 11035 , ChemSpider : 10467544 , Wikidata : Q27289426 .
↑ Directive 62/2645 / EEC (PDF) of the Council for the approximation of the laws of the member states for coloring substances that may be used in food.

[CosIng-1] Entry on CI 13015 in the CosIng database of the EU Commission, accessed on December 28, 2019.

[TCI-2] ↑ ^a ^b ^c ^d ^e ^f Entry on Tropaeolin O at TCI Europe, accessed on December 27, 2019.

[Shmuel_Yannai-3] Shmuel Yannai: Dictionary of Food Compounds with CD-ROM: Additives, Flavors, and Ingredients . CRC Press, 2004, ISBN 1-58488-416-9 , pp. 353 ( limited preview in Google Book search).

[4] External identifiers of or database links to Chrysoine S : CAS number: 2050-34-2, EC number: 218-087-0, ECHA InfoCard: 100.016.444 , PubChem : 11035 , ChemSpider : 10467544 , Wikidata : Q27289426 .

[5] Directive 62/2645 / EEC (PDF) of the Council for the approximation of the laws of the member states for coloring substances that may be used in food.