Victoria blue BO, also known as C.I. Basic Blue 7 and C.I. 42595, is a chloride salt of a dye with the chemical formula [C₃₃H₄₀N₃]Cl. It has the appearance of a reddish blue powder. Victoria Blue BO base, also known as Solvent Blue 5 and C.I. 42595:1, is the hydroxide derivative of the same cation. Its chemical formula is [C₃₃H₄₀N₃]OH. Victoria blues are members of the triarylmethane dyes, but unlike most such dyes, the Victoria blues have a naphthylamine group.^[1]

Quick Facts Names, Identifiers ...

Victoria blue BO

Names
Other names C.I. Basic Blue 7; C.I. 42595
Identifiers
CAS Number	2390-60-5 Y
3D model (JSmol)	Interactive image
ECHA InfoCard	100.017.485
EC Number	219-232-0
PubChem CID	75444
UNII	30F6F48H95 Y
CompTox Dashboard (EPA)	DTXSID5038888
InChI InChI=1S/C33H39N3.ClH/c1-6-34-32-24-23-31(29-13-11-12-14-30(29)32)33(25-15-19-27(20-16-25)35(7-2)8-3)26-17-21-28(22-18-26)36(9-4)10-5;/h11-24H,6-10H2,1-5H3;1H Key: ROVRRJSRRSGUOL-UHFFFAOYSA-N
SMILES [Cl-].CCNc1ccc(c2ccccc12)C(c3ccc(cc3)N(CC)CC)=C4C=CC(C=C4)=[N+](CC)CC
Properties
Chemical formula	C33H40N3Cl (chloride) C33H41N3O (hydroxide)
Appearance	Reddish blue powder
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H315, H318, H319, H410
Precautionary statements	P264, P270, P273, P280, P301+P310, P302+P352, P305+P351+P338, P310, P321, P330, P332+P313, P337+P313, P362, P391, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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Victoria Blue BO is used to dye anionic substrates, e.g. wool, silk, nylon, and acrylics, where bright dying is required. It is also used for staining in microscopy, where it is used to stain mitochondria. As Solvent Blue 5, it is used in some pyrotechnic compositions for blue colored smoke. It is used to dye wool and silk directly producing a violet blue colour but cotton must be mordant with tannin.

Victoria blue BO is a photosensitizer.