A bright, powerful green-blue. Valued by artists for its transparency, it gives very clear washes when well diluted. PB15 is divided into distinctive commercial types.
PB15 : 1, PB15 : 2, PB15 : 3 etc. There is little difference between them in chemical make up and all are equally lightfast. The colour varies slightly between the various types, some being greener than others.
Rated 11 (very good) as a watercolour and 1 (excellent) as an oil paint, acrylic or gouache following ASTM testing. An excellent all round pigment.
Phthalocyanne Blue is very powerful and has to be handled with some care as it will quickly influence most other colours in a mix. Non-metallic preservatives.