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Description

Color Swatch

Pigment Info

00425-3413 — Scarlet Lake

The formulation of each color is modified individually to compensate for the inherent differences in the working characteristics of pigments. The result is an even consistency across the entire palette of colors.

Scarlet Lake

This color contains the following pigments:

PR188 —Naphthol Red
PO69—Isoindoline Orange 69

PR188 —Naphthol Red

Pigment Type

organic monoazo

Chemical Name

n/a

Chemical Formula

C₃₃H₂₄Cl₂N₂O₆

Properties

This Naphthol Red is yellowish, with a high tinting strength and average drying time. It produces warmer shades and tints.

Permanence

This Naphthol Red has excellent lightfastness, though it is generally not considered adequate 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.

Alternate Names

Naphthal, Naphthol Bordeaux, Naphthol Carbamide, Naphthol Carmine, Permanent Carmine, Permanent Red.

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PO69—Isoindoline Orange 69

Pigment Type

organic, azomethine

Chemical Name

isoindoline orange

Chemical Formula

n/a

Properties

Isoindoline Orange 69 is an opaque, brownish orange pigment with moderate tinting strength.

Permanence

Isoindoline Orange 69 has good lightfastness, but its use in automotive and industrial finishes has declined because it tends to bleach or fade.

Toxicity

Isoindoline Orange 69 is not considered toxic.

History

The first isoindoline pigments were patented in 1946, and commercial production of pigments in this group began in the 1960s. Isoindoline Orange 69 was introduced in 1964. For some years, it was common in industrial and automotive paints, but its use declined as alternative, more durable orange pigments replaced it.