Orange II (Tropaeolin OOO)
Name: Orange II (Tropaeolin OOO)
CAS Registry Number: 633-96-5
CA Index Name: Benzenesulfonic acid, 4-[2-(2-hy-droxy-1-naphthalenyl)diazenyl]-, sodium salt (1:1)
Other Names: Acid Orange; Acid Orange A; Benzenesulfonic acid, 4-[(2-hydroxy-1-naphthalenyl)azo]-, monosodium salt; C.I. Acid Orange 7, monosodium salt; Benzenesulfonic acid, p-(2-hydroxy-1-naphthylazo)-, sodium salt; b-Naphthol Orange; b-Naphthyl orange; 11550 Orange; 2-Naphthol Orange II; AO 7; Acid Leather Orange PRW; Acid Leather Orange extra; Acid Orange 7; Acid Orange II; Acilan Orange II; Airedale Orange II; Amacid Orange Y; Amacid Orange Y Conc; Apollo Acid Orange II; Atul Acid Orange II; BTK Orange II; Basacid Orange 280; Basacid Orange 282; Benzenesulfonic acid, 4-[2-(2-hydroxy-1-naphthalenyl)diazenyl]-, monosodium salt; Betanaphthol orange; Borunil Orange A 2R; Brasilan Orange A; Bucacid Orange A; C Ext. Orange 8; C.I. 15510; C.I. Acid Orange 7; Calcocid Orange Y; Certiqual Orange II; Colacid Orange; Colocid Orange II; Color-osacid Orange; Conacid Orange L; Concorde Acid Orange II; Concorde Leather Orange MT; Covalene Orange II; Curol Orange; D and C Orange 4 Aluminum Lake; D and C Orange No. 4; D&C Orange #4; D&C Orange No. 4; D&C Orange No. 4-307005; D&C Orange No. 4-90121; Daedo Acid Orange 2G; Derma Fur Orange R 125; Dermacid Orange 2R; Diacid Orange II; Dinacid Orange II; Duasyn Acid Orange P; Dyacid Orange II; Dycosacid Orange Yellow II; Dynacid Orange Y; Egacid Orange II; Eniacid Orange II; Erio Orange II; Everacid Orange II; Fenazo Orange; Hidacid Orange II; Hispacid Orange AF; Ichoacid Orange II; Indacid Orange II; Japan Orange 205; Japan Orange No. 205; Java Orange II; Kemacid Orange II; Keyacid Orange II; Kiton Orange II; Kromon Lake Orange Toner; Lake Orange A; Lake Orange II YS; Leather Orange Extra; Libacid Orange LII; Lurazol Orange E; Lurazol Orange EBR; Lutetia Orange 3JR; Mandarin G; Multacid Orange II; Multicuer Orange II; Naph-349 thalene Lake Orange G; Naphthalene Orange G; Naphthol Orange; Naphthol Red J; Naphtocard Orange II; Neelicol Orange II; Neklacid Orange II; No. 177 Orange Lake; Nubilon Orange R; Orange 2; Orange 2 sodium salt; Orange Extra N; Orange Extra P; Orange II; Orange II 307004; Orange II90121; Orange II Special For Lacquer; Orange II for Lakes; Orange IIC; Orange IIP; Orange IIS; Orange IISM; Orange No. 205; Orange Toner GRT; Orange Y; Orange YA; Orange YZ; Pacid Orange II; Peeracid Orange II; Persian Orange; Persian Orange Lake; Persian Orange X; Pure Orange IIS; Rifa Acid Orange 2G; Rifa Acid Orange II; Rifa Leather Orange BR; Ritacid Orange II; Romexal Orange; Rybacel Orange A; Sandal Acid Orange II; Sanyo Gum Orange A; Sodium 4-(2-hydroxy-1-naphthylazo)benzenesulfonate; Solar Orange; Special Orange GR; Special Orange H; Sulfacide Orange JR; Symuler Orange Lake 43; Symulon Acid Orange II; Takaoka Acid Orange II; Tangarine Lake X 917; Tertracid Orange II; Triacid Orange II; Tropaeolin OOO; Tropaeo-lin OOO 2; Tropeolin OOO; Vibra Color Orange AOR 7; Vicoacid Orange II; Vondacid Orange II; Vopsider Orange A; Water Orange 060506; Wool Orange A; p-(2-Hydroxy-1-naphthylazo)benzenesulfonic acid sodium salt
Merck Index Number: 6858
Chemical / Dye Class: Azo
Molecular Formula: C16H11N2NaO4S
Molecular Weight: 350.32
Physical Form: Orange-brown powder
Solubility: Very soluble in water; very slightly soluble in ethanol
Melting Point: 164 °C
pH Range: 7.4-8.6; 10.2-11.8
Color Change at pH: Amber (7.4) to orange (8.6); orange (10.2) to red (11.8)
pKa: 8.26, 11.4
Absorption (λmax): 483 nm
Synthesis: Synthetic methods
Staining Applications: Drinks; candies; Heinz bodies in erythrocytes; Horny cells; eye shadow; lips; skin; tooth; hairs; keratin fibers
Biological Applications: Cosmetics; wound dressing materials
Industrial Applications: Organic light emitting devices; inks; cleansing products; textiles
Safety / Toxicity: Acute toxicity; carcinogenicity; environmental toxicity; fish toxicity; genotoxicity; mutagenicity
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