PB15:4 CI#74160 60% of Peacock blue in a tube Toxicity: Non-toxic Lightfastness: 8/8 Drying time: Average Color/ Tone: Cool, green-leaning blue Transparency: Transparent—ideal for glazing
(PB15:4)is a vibrant, cool blue pigment from the phthalocyanine family.
History: In 1935, it was accidentally discovered by chemists at Scottish Dyes Ltd. while researching phthalocyanine dyes. In the 1940s–50s, it was rapidly adopted by artists as a superior alternative to Prussian Blue (PB27) and ultramarine.
