Indigo Blue – Series 1

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Art Spectrum® Indigo Blue is a deep purple between blue and violet on the spectrum. Here it is based on a combination of Ultramarine and Prussian blue. The colour has been used since ancient times when both the ancient Greeks and the Romans sourced it from India where it was made from the plant Indigofera Tinctora .

Its name in Greek, ινδικόν  (or ‘Indikon’), simply means ‘dye’.

Pigments Lightfastness Permanence Opacity Granulating /Staining
PB29, PBk6, PB15:3 ASTM II ***         (very good) Semi-Transparent Staining

ASTM Approved Permanent Colours American Society for Testing and Materials, conforming to standard D4302-90.

In accordance with proven traditional methods of production, all Art Spectrum® Artists’ Watercolours are carefully stone milled to enhance the individual brilliance of each selected permanent pigment and to maximise its handling qualities.