Gamblin 1980 Oils - Cadmium Orange, 150 ml (5.07oz)

Gamblin 1980 Oils - PO20-Cadmium Orange; PO62-Benzimidazolone Orange

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 and was 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 and was 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 of its 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 group of pigments 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.