R&F Pigment Stick - Sap Green, 38 ml
Sap Green is considered a warm deep green for it has a more yellowish undertone, compared to Hooker’s Green which is a bit bluer. Both greens are useful in flora and landscaping and are popular on an artist's palette.
- Pigment Composition: PY83-Diarylide Yellow 83; PG7-Phthalo Green; PR101-Red Iron Oxide
- Dimension: 38 ml. stick measuring 5" x 3/4" diameter
- Paint Lines: Encaustic Pigment Stick
- Opacity: Mixed
- Pigment Stick Drying Rate: Medium
- Classification: Synthetic Organic, Earth
- Chemical Composition: Disazo (diarylide), chlorinated copper phthalocyanine, transparent iron oxide
- Safety Information: Conforms to ASTM D-4236
- Safety Warnings: This product contains cadmium, a chemical known to the State of California to cause cancer.
Pigment Name: PY83 Diarylide Yellow 83
Classification: Synthetic Organic, disazo
Chemical Composition: Disazo (diarylide)
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 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 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 essential in printing inks.
Pigment Name: PG7 Phthalo Green
Classification: Synthetic Organic
Chemical Composition: 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 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.
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.
Pigment Name: PR101 Red Iron Oxide
Classification: Synthetic Organic, Earth
Chemical Composition: Iron oxides (synthetic), iron oxide, silica, alumina, lime, and magnesia or hydrated iron oxide
Properties
Red iron oxide varies in hue and transparency, depending on hydration and slight impurities. Indian Red is a slightly duller, deep brick hue with a bluish undertone. It is very dense and opaque, with excellent tinting strength and covering power. It is dependable when mixed with all other permanent pigments and yields good flesh tints when mixed with Zinc White. It is the synthetic version of PR102, a pigment made from earth reds or natural red iron oxides, and the names applied to PR101 and PR102 often overlap. Synthetic red iron oxides have mostly replaced natural red iron oxides and are brighter, more robust, refined, and more permanent. Indian Red is the highest grade bluish shade. Light Red, English Red, and Venetian Red are yellowish shades. Mars Violet is a dull and subdued bluish or purplish oxide.
Permanence
Red iron oxide is very lightfast and has excellent permanence.
Toxicity
Red iron oxide has no significant hazards.
History
Natural red iron oxide comes from the mineral ore hematite, which the ancient Greeks called bloodstone from the word hema, meaning blood. Hematite is one of the oldest pigments, has been used by every major civilization, and was an essential mineral for medieval alchemists. It was not widely used in artists' materials until the 17th century and was not produced in large quantities until the 18th century.
