Victoria Blue 4R
The dyes named victoria blue are all very similar and they are sometimes confused and substituted for each other in staining solutions, often without any difference in the results. Compare this dye to its close relatives, victoria blue B, victoria blue R and night blue. If one of these three is required but is unavailable, it is worth trying one of the others as a substitute.
R. D. Lillie.
Conn's Biological Stains
Williams & Wilkins, Baltimore, MD., U.S.A.
Edward Gurr, (1971)
Synthetic dyes in biology, medicine and chemistry
Academic Press, London, England.