Sennelier Watercolour S1 Hooker's Green (809)

Hooker's Green (809) Phthalo Green is a transparent, cool, bright, high-intensity colour. An excellent base colour for mixing a range of bright greens. Phthalo Green is considered a good alternative to Viridian because it is intense, mixes well, and can be used to emphasize mineral colours in various tints. However, its tinting strength is very high, so that it can overpower other colours. Diarylide Yellow is a semi-opaque, moderately staining, intense, deep reddish yellow pigment with good tinting strength.

Pigment Name: Diarylide Yellow PY83

Diarylide Yellow is a semi-opaque, moderately staining, intense, deep reddish yellow pigment with good tinting strength.

Permanence: Diarylide Yellow 83 has excellent lightfastness and permanence. However, it can fade in tints, so some artists do not consider it suitable as an artist’s colour. Many other diarylide yellow pigments are reported to have fair to poor lightfastness, and some are entirely fugitive. Diarylide Yellow 83 is reputed to be one of the most permanent of the entire group.

Toxicity: Diarylide Yellow has no significant acute hazards, but chronic hazards have not been well studied.

History: Diarylide Yellow comes from a family of azo pigments called Diarylide. These yellow-hued pigments were developed around 1940 and are very important in printing inks.

Alternate Names: Benzidine Yellow, Diazo Yellow.

Pigment Name: Phthalo Green PG7

Phthalo Green is a transparent, cool, bright, high-intensity colour used in oil and acrylics. It comes from a Phthalocyanine Blue pigment where most hydrogen atoms have been replaced with chlorine, forming highly stable molecules. It has pigment properties and permanence similar to Phthalo Blue. It is slow drying and an excellent base colour for mixing a range of bright greens. Phthalo Green is considered a good alternative to Viridian because it is intense, mixes well, and can be used to emphasize mineral colours in various tints. However, its tinting strength is very high, so that it can overpower other colours. This pigment most closely resembles the discontinued and toxic Verdigris. Chemical Name: polychlorinated copper(II) phthalocyanine. Chemical Name: polychlorinated copper(II) phthalocyanine

Permanence: Phthalo Greens are completely lightfast and resistant to alkali, acids, solvents, heat, and ultraviolet radiation. 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 Green has no significant hazards, but it contained PCBs (polychlorinated biphenyls) until 1982.

History: This bright blue-green was developed in 1935 and has been used since 1938.

Alternate Names: Bocour Green, Cyan Green, Intense Green, Monastral Green, Phthalocyanine Green, Rembrandt Green, Thalo Green, Winsor Green.