Gamblin 1980 Oils - PB15:2 Phthalo Blue; PY83 Indian Yellow;
HR70 Diarylide Yellow
Gamblin’s approach is different. 1980 colours contain pure
pigments, the finest refined linseed oil, and marble dust (calcium carbonate).
Since oil painting began, these three ingredients have made more affordable colours.
Painters experience true colours without homogenized texture
or muddy colour mixtures. Gamblin's approach to using traditional raw materials and processes ensures that artists experience the luscious working properties they expect from their oil colours.
Sap green is originally made from berries. This lightfast
colour is a predictable mixture that can be easily warmed with Hansa Yellows or
cooled with blues.
PIGMENT COMPOSITION AND PERMANENCE
- Pigment Name: PB15: 1 Phthalo Blue (alpha copper
phthalocyanine)
- Pigment Type: Organic
PROPERTIES
Phthalo Blue PB15:1 is a structural variant of Phthalo Blue
PB15 that produces more reddish 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
made from a British dyestuff plant. The demand for such a pigment came from
commercial printers who wanted a cyan to replace Prussian Blue.
PIGMENT COMPOSITION AND PERMANENCE
- Pigment Name: PY83 Indian Yellow Diarylide Yellow 83; HR70
- Pigment Type: organic, disazo
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.
Indian Yellow: This colour has been prized for hundreds of
years but has only been made with a completely lightfast pigment.
