R&F Encaustic Paint Block - Phthalo Turquoise, 40 ml

Vivid turquoise undertone. Hue is the midpoint between Phthalo Blue and Phthalo Green.

Pigment Composition: PG7-Phthalo Green; PB15:3-Phthalo Blue

• Paint Lines: Encaustic, Pigment Stick
• Opacity: Transparent
• Pigment Stick Drying Rate: Medium
• Classification: Synthetic Organic
• Chemical Composition: Phthalo Blue + Phthalo Green
• Safety Information: Conforms to ASTM D-4236

Pigment Name: PG7-Phthalo Green

Classification: 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 of the 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 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 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: PB15:3-Phthalo Blue

Classification: Organic

Chemical Composition: Beta copper phthalocyanine

Properties

Phthalo Blue PB15:3 is a structural variant of Phthalo Blue PB15 that produces more greenish tones.

Permanence

Phthalo Blues are lightfast, stable, and permanent for all paint uses. 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 Blues have no significant hazards, although those made before 1982 contained some PCBs (polychlorinated biphenyls).

History

Developed by chemists using the trade name Monastral Blue, the organic blue dyestuff, now known as Phthalo Blue, was presented as a pigment in November 1935 in London. Its discovery was accidental. The dark colour was observed in a kettle where a dye was being made from a British dyestuff plant. The demand for such a pigment came from commercial printers who wanted a cyan to replace Prussian Blue.