Indigo is a deep blue pigment that can range from dark black to pale blue. Originally extracted from plants similar to blue woad used by the ancient Britons, it was synthesised in 1878 in Germany. It is one of the oldest blue pigments used universally.
Colour Number
322
Permanence
A
Permanence Description
Permanent
Lightfastness Code
I
Lightfastness Description
Excellent
Opacity Description
Opaque
Series
1
Pigment Codes
PB15 • PB29 • PBk6