Art Spectrum Artists’ Watercolor Tube - Australian Leaf Green Dark, 10 ml

Pigment Information

This color contains the following pigments:

PY129-Green Gold

PG7-Phthalo Green

PR175-Benzimidazolone Red

PY83-Diarylide Yellow 83

Pigment Name

PY129-Green Gold

Pigment Type

organic, polymethine

Chemical Name

copper azomethine green

Properties

A transparent greenish yellow pigment with low tinting strength.

Permanence

Pigment PY129 has been reported to have very good lightfastness.

History

Pigment Yellow PY129 has been used in automotive coatings.

Pigment Name

PG7-Phthalo Green

Pigment Type

organic

Chemical Name

polychlorinated copper(II) phthalocyanine

Chemical Formula

C32H3Cl13CuN8 to C32HCl15CuN8 or C32H16CuN8Cl15 (PG7) or C32Br6Cl10CuN8 (PG36)

Properties

Phthalo Green is a transparent, cool, bright, high intensity color used in oil and acrylics. It comes from a Phthalocyanine Blue pigment where most of the 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 an excellent base color for mixing a range of bright greens. Phthalo Green is considered a very good alternative to Viridian because it is intense and mixes well and can be used to emphasize mineral colors in various tints. However, its tinting strength is very high, so it can overpower other colors. 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. They are currently used in inks, coatings, and many plastics due to their stability and are considered a standard pigment in printing ink and the packaging industry.

Pigment Name

PR175-Benzimidazolone Red

Pigment Type

monoazo, organic synthetic

Chemical Formula

C26H19N5O5

Properties

Benzimidazolone Red is a transparent, dull, yellowish red with an average drying time. It lacks the color, purity, and brightness characteristic of most organic synthetic pigments.

Permanence

Benzimidazolone Red has excellent lightfastness.

History

The benzimidazolone group of pigments was developed and patented in 1960 by Hoechst A.G., a German chemical manufacturer that was a forerunner of the pharmaceutical company Aventis.

Pigment Name

PY83-Diarylide Yellow 83

Pigment Type

organic, disazo

Chemical Formula

C36H32Cl4N6O8

Properties

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

Permanence

Diarylide Yellow 83 has very good lightfastness and permanence. However, it can fade in tints, so some artists do not consider it suitable as an artists' color. Many other diarylide yellow pigments are reported to have fair to poor lightfastness, and some are completely fugitive. Diarylide Yellow 83 is reputed to be one of the most permanent of the entire group.

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.