Winsor & Newton Artists' Oil Color - Purple Madder, 37 ml tube

Pigment Information

This color contains the following pigments:

PV19-Quinacridone Violet

PBr25-Benzimidazolone Brown

Pigment Name

PV19-Quinacridone Violet

Pigment Type

organic synthetic, quinacridone

Chemical Formula

C20H12N2O2

Properties

Quinacridone Red is a high performance, transparent pigment with an average drying time and uneven dispersal. It is another name for Quinacridone Violet (PV19) and Quinacridone Red (PR192). Quinacridone pigments have relatively low tinting strength in general. For this reason, quinacridone colors are often expensive, because more pigment is required in the formulation.

Permanence

Quinacridone Violet has excellent lightfastness and is considered the most lightfast organic pigment in this shade range.

Pigment Name

PBr25-Benzimidazolone Brown

Pigment Type

organic, monoazo benzimidazolone

Properties

Benzimidazolone Brown is a transparent brown pigment that is heavily staining and dark valued but has moderately low tinting strength. According to its manufacturer Clariant, “It is a dark brown, very transparent benzimidazolone pigment with excellent light, weather, and solvent fastness properties plus high heat stability. Recommended for paste inks, solvent and water based packaging gravure, and flexographic printing inks.” Benzimidazolone Brown has been used in watercolor painting, where transparent brown colors have traditionally been mixed from other pigments.

Permanence

Benzimidazolone Brown has excellent lightfastness and weather resistance.

History

Benzimidazolone pigments were developed and patented by Hoechst in 1960, and have gradually come into use as artist pigments.