Victoria Blue BO

  Victoria Blue BO, also known as C.I. Basic Blue 7 and C.I. 42595, is a chloride salt of a synthetic blue triarylmethane dye. Its chemical formula is C₃₃H₄₀N₃Cl. It has the appearance of a reddish blue powder. It is a photosensitizer.

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Its CAS number is [2390-60-5] and its SMILES structure is [Cl-].CCNc1ccc(c2ccccc12)C(c3ccc(cc3)N(CC)CC)=C4C=CC(C=C4)=[N+](CC)CC. Its EINECS number is 219-232-0.

Victoria Blue BO base, also known as Solvent Blue 5 and C.I. 42595:1, is a hydroxide instead of chloride. Its chemical formula is C₃₃H₄₁N₃O. Its CAS number is [1325-86-6].

Victoria Blue BO is used to dye anionic substrates, eg. 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.