Oil Blue 35^[1] is a blue anthraquinone dye used for colouring alcoholic and hydrocarbon based solvents, including oils, fats, and waxes. It is used also in lacquers and inks. In some countries, it is used as a fuel dye. It is also used in some blue colored smoke formulations. In microscopy, it is used as a staining dye. When exposed to 5% hydrochloric acid solution, it becomes dirty green.

Oil Blue 35

Names
IUPAC name 1,4-Bis(butylamino)anthraquinone
Preferred IUPAC name 1,4-Bis(butylamino)anthracene-9,10-dione
Other names Solvent Blue 35 Blue 2N Blue B Oil Blue B CI 61554
Identifiers
CAS Number	17354-14-2 Y
3D model (JSmol)	Interactive image
ChemSpider	2994956
ECHA InfoCard	100.037.602
EC Number	241-379-4
PubChem CID	3766139
UNII	ZVT4Q30OQY Y
CompTox Dashboard (EPA)	DTXSID5044605
InChI InChI=1S/C22H26N2O2/c1-3-5-13-23-17-11-12-18(24-14-6-4-2)20-19(17)21(25)15-9-7-8-10-16(15)22(20)26/h7-12,23-24H,3-6,13-14H2,1-2H3 Key: OCQDPIXQTSYZJL-UHFFFAOYSA-N InChI=1/C22H26N2O2/c1-3-5-13-23-17-11-12-18(24-14-6-4-2)20-19(17)21(25)15-9-7-8-10-16(15)22(20)26/h7-12,23-24H,3-6,13-14H2,1-2H3 Key: OCQDPIXQTSYZJL-UHFFFAOYAW
SMILES O=C2c1ccccc1C(c3c2c(NCCCC)ccc3NCCCC)=O
Properties
Chemical formula	C22H26N2O2
Molar mass	350.462 g·mol−1
Melting point	104–105 °C (219–221 °F; 377–378 K)
Solubility in water	insoluble
Solubility	acetone, benzene, and toluene
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references