Gamblin 1980 Oils - PO20-Cadmium Orange;
PO62-Benzimidazolone Orange
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 of using both traditional raw
materials and processes ensures that artists experience the luscious working
properties that they expect from their oil colours.
Cadmium Orange: Gamblin Cadmium Colours are in regular
chromatic steps from Cadmium Yellow Light through Cadmium Red Deep. Chemically
pure Cadmium Orange is a medium opaque orange. No health labelling is required.
Cadmium Orange was the first true orange, made by mixing
Cadmium Yellow with Cadmium Red. It is a pure hue with excellent opacity and
low toxicity compared with its predecessors. It also has very high hiding
power.
PIGMENT COMPOSITION AND PERMANENCE
- Pigment Name: PO20-Cadmium Orange
- Pigment Type: cadmium
PROPERTIES
Cadmium Orange was the first true orange, made by mixing
Cadmium Yellow with Cadmium Red. It is a pure hue with excellent opacity and
low toxicity compared with its predecessors. It also has very high hiding
power. The deeper shades possess the greatest tinting strengths.
Only the highest grades contain pure Cadmium Orange without
barium mixed in it.
Cadmium pigments have been partially replaced by azo
pigments, similar in lightfastness to the cadmium colours, cheaper, and
non-toxic.
PERMANENCE
Cadmium Orange has excellent permanence, but like many
cadmium pigments, it will fade in fresco or mural painting. The deeper
varieties of this pigment are the most permanent. The paler varieties have been
known to fade when exposed to sunlight.
TOXICITY
Cadmium Orange is a known human carcinogen. It is highly
toxic if inhaled and slightly toxic if ingested.
HISTORY
Cadmiums get their names from the Latin word cadmia, meaning
zinc ore calamine, and the Greek word kadmeia, meaning Cadmean earth, first
found near Thebes, the city founded by the Phoenician prince Cadmus. Metallic
cadmium was discovered in 1817 by Friedrich Strohmeyer.
It was used sparingly after its discovery due to the
scarcity of cadmium metal.
PIGMENT COMPOSITION AND PERMANENCE
- Pigment Name: PO62-Benzimidazolone Orange
- Pigment Type: organic, monoazo
PROPERTIES
Benzimidazolone Chemical Orange is a staining, yellowish-orange
pigment that can become dull in tints. It has an average drying time and loses
some intensity as it dries. The yellowish-orange varieties are more
transparent.
PERMANENCE
Benzimidazolone Orange has excellent lightfastness and
outstanding heat and solvent stability for a monoazo pigment.
TOXICITY
Benzimidazolone Orange is not considered toxic.
HISTORY
The benzimidazole pigment group was developed and
patented in 1960 by Hoechst A.G., a German chemical manufacturer that was a
forerunner of the pharmaceutical company Aventis. The use of benzimidazolone
pigments in the auto industry, especially Benzimidazolone Orange, became common
in the 1980s because they were common replacements for lead chromate pigments,
which were phased out during this period.
