Sennelier Watercolour S2 Bright Yellow Green (871)
Bright Yellow Green (871) is a transparent yellow. It has excellent brightness and tinting strength, and its drying time ranges from average to slow. Hansa Yellow makes more intense tints and cleaner secondaries than Cadmium Yellows, especially when mixed with other organic or modern colours like Phthalo Blue and Green. Because they are more transparent, they have great value as glazing colours. Phthalo Green is a transparent, cool, bright, high-intensity colour—an excellent base colour for mixing a range of bright greens. Tinting strength is very high so that it can overpower other colours.
Pigment Name: PY3—Hansa Yellow 10G
Hansa Yellow is a transparent yellow. It has excellent brightness and tinting strength, and its drying time ranges from average to slow.
Hansa Yellow makes more intense tints and cleaner secondaries than Cadmium Yellows, especially when mixed with other organic or modern colours like Phthalo Blue and Green. Because they are more transparent, they have great value as glazing colours.
Permanence: This Hansa Yellow has fair to good permanence, particularly in the lighter shades.
Toxicity: Hansa Yellow has no significant acute hazards, though its chronic hazards have not been well studied.
History: Hansa Yellows were first made in Germany just before WW1 from a series of synthetic dyestuffs called Pigment Yellow. They were intended to be a synthetic replacement for Cadmium Yellow.
Alternate Names: Arylamide Yellow, Arylide, Arylide Yellow, Azo, Brilliant Yellow, Monoazo, Monolite Yellow, Permanent Yellow.
Pigment Name: PG7—Phthalo Green
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
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 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.
