Winsor & Newton Griffin Alkyds - Permanent Sap Green, 37 ml tube

Pigment Information

This color contains the following pigments:

PG7-Phthalo Green

PY129-Green Gold

PR88-Thioindigoid Red

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.

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 in use since 1938.

Pigment Name

PY129-Green Gold

Pigment Type

organic, polymethine

Chemical Name

copper azomethine green

Chemical Formula

Properties

A transparent greenish yellow pigment with low tinting strength.

Permanence

Pigment PY129 has been reported to have very good lightfastness.

Toxicity

Pigment PY129 is not considered to be hazardous.

History

Pigment Yellow PY129 has been used in automotive coatings.

Pigment Name

PR88-Thioindigoid Red

Pigment Type

indigoid, vat

Chemical Formula

C16H4Cl4O2S2

Properties

Thioindigoid Red is a relatively clean red considered to be a vat pigment. It has an average drying time.

Permanence

Thioindigoid Red has excellent lightfastness.

Toxicity

Thioindigoid Red is not considered toxic.

History

Unknown.