Range :Old Holland Classic Watercolours
Colourname :Indigo extra
Colournumber :33
Serie :B
Pigment classification :
Colour index :PB15:3-PR177-PBK9
Colour index number :74160-65300-77267
Lightfastness : Lightfast pigment according to ASTM
category 1 and 2
Opacity/transparency :Transparent