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Victoria Blue (PTMA)

PB1

Alternate Names

Basic Blue 26

Basic Blue 11

Fast Blue

Brilliant Blue

PTA

Pigment Description

Extremely poor lightfastness in gouache. This color may be related to PB2 as well. Several varieties of this aniline dye seem to be around. If the specifics are important to your work, please consult other sources to determine the precise kind of dye that is being used, as it seems that Victoria Blue has changed over the years.

Resources

PB1 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com

CAMEO Materials Database: Conservation & Art Materials Encyclopedia Online, Museum of Fine Arts Boston. (Accessed June 2025). Victoria Blue https://cameo.mfa.org/wiki/Victoria_blue. Museum of Fine Arts Boston.

Stats

Lightfastness

Very Poor

Poor

Transparency

Transparent

Toxicity

Lower Concern

Treat all pigments and paints with studio safety protocols.

Chemical Name

Triphenylmethane: PTMA salt of Basic Blue 7 dye, or Triphenylmethane Phospho-tungstomolybdic acid salt

C₃₃H₃₁N₃ - HCl

with PB1 (Victoria Blue (PTMA))

No single-pigment Oil found with PB1

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