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PR122—Quinacridone Magenta

Pigment Type

organic, quinacridone

Chemical Name

n/a

Chemical Formula

C₂₂H₁₆N₂O₂

Properties

Quinacridone Magenta is a semi-transparent and powerful red with an impressive mixing range. It makes an excellent glazing color and is one of the bluest of the Quinacridone colors.

Permanence

Quinacridone Magenta is very permanent with excellent lightfastness in most media, but some argue it is less lightfast in watercolor form.

Toxicity

Quinacridone Magenta has no acute hazards. Overexposure to quinacridone pigments may cause skin irritation. Quinicridone pigments contain a compound found to be a skin, eye, and respiratory irritant.

History

Quinacridone Magenta came from a red violet aniline dye that was first produced in 1858 by Natanson. It was called Magenta to commemorate a battle in Magenta, Italy. Over time, Magenta became the standard color name for a deep, violet red. Although quinacridone compounds became known in the late 19th century, methods of manufacturing so as to make them practical for use as commercial pigments did not begin until the 1950s.

Alternate Names

Acra Red, Quinacridone Violet (PV19), Thalo Red Rose.

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.