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Victoria blue R 
Summary
Victoria blue R is a dye with formula C29H32N3Cl. It has a blue colour that changes to yellow at low pH values.
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| Names | |
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| IUPAC name
[4-[Bis[4-(dimethylamino)phenyl]methylidene]naphthalen-1-ylidene]-ethylazanium chloride
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| Other names
Basic Blue 11; Victoria Blue RS; Victoria Lake Blue R; Basic Blue; Hidaco Victoria Blue R; Aizen Victoria Blue BOH
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| Identifiers | |
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| ChEBI |
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| ECHA InfoCard | 100.016.884 |
PubChem CID
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CompTox Dashboard (EPA)
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| 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).
Infobox references
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Physical data edit
Fastness
The dye exerts a high light fastness and washing fastness.
UV/VIS absorption
Victoria Blue R has an absorption peak of around 610nm.