Sennelier Oil Pastel - Payne's Gray

Pigment Information

This color contains the following pigments:

PBk1-Aniline Black

PR83-Alizarin Crimson

PB60-Indanthrene Blue

Pigment Name

PBk1-Aniline Black

Pigment Type

organic, azine

Properties

Analine black was the first black dye used to color cotton.

Permanence

As a clothing dye, it has been reported to have excellent lightfastness.

Toxicity

Testing of analine black dye on rabbits has shown that it is not an skin or eye irritant.

History

Analine Black was discovered by Lightfoot in 1863. It has been used ever since as a black dye for coloring cotton.

Pigment Name

PR83-Alizarin Crimson

Pigment Type

organic

Chemical Name

1,2-dihydroxyantraquinone

Chemical Formula

C14H8O4

Properties

Alizarin Crimson, the traditional cool counterpart to Cadmium Red, is a clear ruby-red with a maroon masstone and a bluish undertone. It is the artist's principal deep red pigment, is transparent, and has good tinting strength. It creates bright rosy pinks when mixed with white, a range of purples and violets when mixed with strong blues, can be slow drying when used with oils, and is compatible with all other pigments. Permanent Alizarin Crimson mixes well with Ultramarine in acrylic and watercolor form. Permanent Rose and Quinacridone Rose are possible alternatives on a watercolor palette. Alizarin Crimson is a popular glazing color.

Permanence

Alizarin Crimson is considered fugitive or marginally lightfast, and the appropriateness of its use in the modern artist palette is a subject of debate. There are many concerns regarding its permanence, particularly when mixed with ochre, sienna, and umber, or when used thinly. It is the least permanent red commonly used by today's artists. Modern synthetic preparations of Alizarin Crimson have better permanence and lightfastness that the original natural pigment, which was extracted from the madder plant. Quinacridone pigments have been used to create a modern hue that closely matches the original hue, but many artists object that the transparency and handling characteristics are not the same as for the original.

Toxicity

Alizarin Crimson can be slightly toxic if it comes into contact with skin and may cause some allergies. There is no significant acute toxicity.

History

The word alizarin comes from the Arabic word al-usara, meaning juice. The base ingredient of this pigment is the Madder plant (Rubia Tinctorum). It was used for dyes and inks among craftsmen in Ancient Persia, India, and Egypt as early as 1500 BC In 1804, George Field, an English dye maker, developed Madder Lake by binding madder to alum, a white powder. The German chemists Carl Grabe and Carl Liebermann produced the first synthetic variety of this pigment, most commonly known as Alizarin Crimson, in 1868. They used anthracene, which greatly improved the lightfastness. The Colour Index International designation PR83:1 has been used to identify this synthetic laked pigment.

Pigment Name

PB60-Indanthrene Blue

Pigment Type

organic, vat dyes

Chemical Name

complex, insoluble anthraquinone

Chemical Formula

C28H14N2O4

Properties

Indanthrene Blue is a clear, clean, deep blue organic pigment. It has moderate to high tinting strength and is not as overpowering as Phthalo Blue. Hansa Yellow Deep, Benzimidazolone Orange, and Raw Umber are its best mixing complements.

Permanence

Indanthrene Blue is permanent with excellent lightfastness in both masstone and tints.

Toxicity

Indanthrene Blue varies in its acute toxicity, though toxicity is generally slight.

History

Indanthrene Blue is the oldest vat dye, discovered and patented in 1901 by Rene Bohn. It is considered the first anthraquinone vat dye, a group of dyes characterized by excellent lightfastness. The pigment originates from this dye.