Rembrandt Soft Pastel - Permanent Red Light 370.3, Full Stick

Pigment Information

This color contains the following pigments:

PO67-Pyrazoloquinazolone Orange

PR254-Pyrrole Red

Pigment Name

PO67-Pyrazoloquinazolone Orange

Pigment Type

organic, monoazo

Chemical Name

pyrazolo-quinazolone orange

Chemical Formula

Properties

Pyrazolo-Quinazolone Orange is an opaque orange pigment which has excellent dispersal and good coverage.

Permanence

Pyrazolo-Quinazolone Orange is extremely lightfast.

Toxicity

History

Pigment Name

PR254-Pyrrole Red

Pigment Type

organic, aminoketone

Chemical Name

Bis-(p-chrolopheny)-1. 4-diketopyrrolo(3. 4-c)pyrrole

Chemical Formula

Properties

Pyrrole Red is opaque and has strong covering power. According to manufacturer Ciba, which uses the trade name Irgazin Red, it is a “clean, highly saturated mid shade red with high temperature resistance, excellent color strength, outstanding chemical, solvent and bleed resistance, and good weatherfastness.”

Permanence

Pyrrole Red is considered to have excellent lightfastness among organic pigments in its class. Tests in industrial applications have given it scores of 7-8 on the Blue Wool Scale.

Toxicity

According to the Australian government's Ministry on Health and Aging, "The notified chemical exhibited low oral and dermal toxicity in rats, did not exhibit toxic effects when administered orally to rats for 28 days, was not a skin irritant in rabbi

History

Pyrrole Red, used as an automotive paint and as a colorant in plastics, was developed as one of a range of pigments to replace lead based pigments. In art materials, it is often used as a synthetic and lightfast replacement for carmine, a laked pigment that was originally produced from the body of the cochineal insect. It is also used to replace the older naphthol reds, organic red pigments that are sometimes only marginally lightfast and weatherfast.