Sennelier Watercolour S1 Blue Sennelier (399) 21 ml

Sennelier Watercolour S1 Blue Sennelier (399)

Phthalo Blue PB15:6 is a structural variant of Phthalo Blue PB15 that produces more yellowish tones. Chemical Name: epsilon copper phthalocyanine.

Permanence: Phthalo Blues are completely lightfast and stable and are permanent for all paint uses. Due to their stability, they are currently used in inks, coatings, and many plastics and are considered a standard pigment in printing ink and the packaging industry.

Toxicity: Phthalo Blues have no significant hazards, although those made before 1982 contained some PCBs (polychlorinated biphenyls).

History: Developed by chemists using the trade name Monastral Blue, the organic blue dyestuff, now known as Phthalo Blue, was presented as a pigment in November 1935 in London. Its discovery was accidental. The dark colour was observed in a kettle where a dye was made from a British dyestuff plant. The demand for such a pigment came from commercial printers who wanted cyan to replace Prussian Blue.

Alternate Names: n/a