Victoria blue R is a dye with formula C29H32N3Cl. It has a blue colour that changes to yellow at low pH values.

Victoria blue R
Names
IUPAC name
[4-[Bis[4-(dimethylamino)phenyl]methylidene]naphthalen-1-ylidene]-ethylazanium chloride
Other names
Basic Blue 11; Victoria Blue RS; Victoria Lake Blue R; Basic Blue; Hidaco Victoria Blue R; Aizen Victoria Blue BOH
Identifiers
ChEBI
ECHA InfoCard 100.016.884 Edit this at Wikidata
Properties
C29H32ClN3
Molar mass 458.05 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Physical data

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Fastness

The dye exerts a high light fastness and washing fastness.

UV/VIS absorption

Victoria Blue R has an absorption peak of around 610nm.