Victoria blue BO

Victoria blue BO
Other names
C.I. Basic Blue 7; C.I. 42595
3D model (Jmol) Interactive image
ECHA InfoCard 100.017.485
EC Number 219-232-0
C33H40N3Cl (chloride)
C33H41N3O (hydroxide)
Appearance Reddish blue powder
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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 [C33H4oN3]OH. Victoria blues are members of the triarylmethane dyes, but unlike most such dyes, the Victoria blues have an naphthylamine group.[1]

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.


  1. Gessner, T.; Mayer, U. (2002), "Triarylmethane and Diarylmethane Dyes", Ullmann's Encyclopedia of Industrial Chemistry 6th Edition, Weinheim: Wiley-VCH, doi:10.1002/14356007.a27_179
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