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
organic, naphthol AS
Chemical Name
n/a
Chemical Formula
C26H22N4O4
Properties
Pigment PR170 is a bright deep red with bluish undertones. It has an average drying time. It has two crystaline forms that differ significantly in opacity. The more transparent form (F5RK) tends to be more bluish and is less lightfast.
Permanence
The lightfastness and weatherfastness of Pigment PR170 varies, depending on the application and the crystaline form. The opaque form (F3RK) has very good lightfastness, and is more weather resistant. The transparent form (F5RK) has lightfastness that is considered acceptable in pure applications, but it fades more in tints. Neither form is considered suitable for exterior use.
Toxicity
Naphthol Reds are not considered toxic. They may cause eye, skin, or respiratory irritation. Contact with dry pigment should be avoided.
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. Pigment Red PR170 is a Naphthol AS pigment, chemically related to the diarylide yellow pigments. The Naphthol AS pigments comprise a range of reds. They are used in plastics, textiles, and printing inks.
Alternate Names
Naphthal, Naphthol Bordeaux, Naphthol Carbamide, Naphthol Carmine, Permanent Carmine, Naphthol Crimson, Permanent Red, Permanent Red F3RK (more opaque), Permanent Red F5RK (more transparent).
PO73—Transparent Pyrrole Orange
Pigment Type
organic, aminoketone
Chemical Name
dipyrrolopyrrol
Chemical Formula
n/a
Properties
Transparent Pyrrole Orange is a yellow-shade orange with optimum performance; high saturation and excellent durability, excellent bleed resistance, and intrinsic strength coupled with good opacity and moderate rheology. It is semi-opaque, less opaque than Cadmium Orange.
Permanence
Transparent Pyrrole Orange has been demonstrated to have excellent stability and lightfastness in automotive applications.
Toxicity
The Australian government's Department of Health and Aging, reported in its Summary Report: NA/238 that "Irgazin DPP Orange 16AOA is likely to be of low oral and dermal toxicity in humans and to be non irritating or very slightly irritating to the eyes and skin. It may cause lung irritation due to its particle size."
History
Irgazin Orange was developed as a lead-free alternative opaque orange pigment. It is used in decorative, industrial, and automotive applications, often to color plastics and polymers.
Alternate Names
Irgazin Orange, Bright Orange, Aritint Ornage, Unisphere DPP Orange, Dipyrrolopyrrol Orange
