Chroma Atelier Interactive Artists' Acrylics - Orange, 250 ml jar

Pigment Information

This color contains the following pigments:

PO5-Dinitraniline Orange

PY65-Hansa Yellow

PO20-Cadmium Orange

Pigment Name

PO5-Dinitraniline Orange

Pigment Type

monoazo

Chemical Formula

C16H10N4O5

Properties

Dinitraniline Orange is a clean, bright, reddish orange. It is generally low cost and has an average drying time.

Permanence

Dinitraniline Orange has full to medium tone lightfastness.

Toxicity

Dinitraniline Orange is not considered toxic.

History

Unknown.

Pigment Name

PY65-Hansa Yellow

Pigment Type

monoazo

Chemical Formula

C18H18N4O6

Properties

This Hansa Yellow ranges from reddish yellow to greenish yellow with temperature shifts from cool to warm hues. It has good tinting strength and average to slow drying time.

Permanence

This Hansa Yellow has excellent lightfastness, particularly in the 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 Name

PO20-Cadmium Orange

Pigment Type

cadmium

Chemical Name

cadmium sulfide and cadmium selenide

Chemical Formula

CdS x CdSe

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 greatest tinting strengths are possessed by the deeper shades. Only the highest grades contain pure Cadmium Orange without barium mixed in it. Cadmium pigments have been partially replaced by azo pigments, which are similar in lightfasness to the cadmium colors, 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 extremely 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.