Gamblin 1980 Oils - PY74 Arylide (Hansa) Yellow: PG7 Phthalo
Green
Permanent Green Light is the colour of the spring grass,
which is bright and warm in the first shoots.
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.
PIGMENT COMPOSITION AND PERMANENCE
- Pigment Name: PY74 Arylide (Hansa) Yellow
- Pigment Type: monoazo
PROPERTIES
Pigment PY74 is one of the most commercially essential
pigments of the Hansa Yellow group, considered superior to many others in its
class based on both tinting strength and lightfastness.
Several PY74 grades with different particle sizes are
available. Grades with finer particle sizes are more brilliant and transparent.
Pigment PY74 ranges from reddish-yellow to greenish-yellow, with temperature
shifts from cool to warm hues. It has high tinting strength and average to slow
drying time.
PERMANENCE
This Hansa Yellow has better lightfastness than other yellow
monoazo pigments, particularly in darker shades.
TOXICITY
Hansa Yellow has no significant acute hazards, though its
chronic hazards have not been well studied.
HISTORY
Hansa Yellows were first made in Germany just before WW1
from a series of synthetic dyestuffs called Pigment Yellow. They were intended
to be a synthetic replacement for Cadmium Yellow.
PIGMENT COMPOSITION AND PERMANENCE
- Pigment Name: PG7 Phthalo Green (Chlorinated polychlorinated
copper(II) phthalocyanine)
- Pigment Type: Organic
PROPERTIES
Phthalo Green is a transparent, cool, bright, high-intensity
colour used in oil and acrylics. It comes from a Phthalocyanine Blue pigment in
which 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 an excellent alternative to
Viridian because it is intense, mixes well, and can 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.
