Color Swatch created using Heavy application/medium application/50% tint and was applied on Acrylic Primed Canvas (7 oz) material.
This color contains the following pigments:
PR170—Naphthol Red
Pigment Type
monoazo
Chemical Name
n/a
Chemical Formula
C26H22N4O4
Properties
This Naphthol Red is a bright deep red with bluish undertones. It has an average drying time.
Permanence
This Naphthol Red has fair to good lightfastness, not because of its masstone, but because it fades in tints. Not suitable for exterior use.
Toxicity
Naphthol Reds are not considered toxic.
History
Naphthol pigments are actually dyes that are "laked" to form pigments. First developed by the German chemical company Hoechst A.G. before World War I, their use in artist paints began in the 1920s.
Alternate Names
Naphthal, Naphthol Bordeaux, Naphthol Carbamide, Naphthol Carmine, Permanent Carmine, Permanent Red.
PO36—Benzimidazolone Orange
Pigment Type
organic, monoazo
Chemical Name
n/a
Chemical Formula
C17H13ClN6O5
Properties
Benzimidazolone Orange is a reddish orange pigment that can lose its intensity and become dull in tints. It has an average drying time.
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 benzimidazolone 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. 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.
Alternate Names
n/a
