M023andnbsp;Deep Green /andnbsp;Vert Foncéandnbsp;- Diarylide Yellow 83 - PY83 (Organic, disazo), PG7-Phthalo Green (Organic, Polychlorinated copper(II) phthalocyanine)

Series: B
Lightfast: **

Pigment 1:andnbsp;Diarylide Yellow 83 - PY83

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.

• Pigments name: PY83-Diarylide Yellow 83
• Pigment Type: Organic, disazo
• Chemical Name: n/a

Properties: 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 for their colour. Many other diarylide yellow pigments 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.

Alternate Names: Benzidine Yellow, Diazo Yellow.

Pigment 2:andnbsp;Phthalo Green PG7

This bright blue-green was developed in 1935 and has been in use since 1938.

• Pigments name:andnbsp;Phthalo Green PG7
• Pigment Type: Organic
• Chemical Name: Polychlorinated copper(II) phthalocyanine

Properties: 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 similar pigment properties and permanence to Phthalo Blue. It is slow drying and excellent base colour for mixing a range of bright greens. Phthalo Green is considered an excellent alternative to Viridian because it is intense and mixes well, and can be used to emphasize mineral colours in various tints. However, its tinting strength is very high to overpower other colours. This pigment most closely resembles the discontinued and toxic Verdigris.

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.

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