Phthalo Blue: Warm blue first made for printmaking ink (cyan) to replace Prussian Blue in the 1920’s. With clean, pure masstone and transparency, Phthalo Blue, like all modern colors, has high tinting strength.
Pigment: Copper phthalocyanine (PB 15:2)
Vehicle: Alkali refined linseed oil
Lightfastness I, Series 2, TRANSPARENT, SDS