Holbein Artists' Oil Color - Light Red Bright, 40 ml tube

Pigment Information

This color contains the following pigments:

PO69-Isoindoline Orange 69

PR101-Red Iron Oxide

Pigment Name

PO69-Isoindoline Orange 69

Pigment Type

organic, azomethine

Chemical Name

isoindoline orange

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.

Pigment Name

PR101-Red Iron Oxide

Pigment Type

earth, synthetic

Chemical Name

iron oxides (synthetic), iron oxide, silica, alumina, lime, and magnesia or hydrated iron oxide

Chemical Formula

Fe2O2 or Fe2O3 x H2O

Properties

Red iron oxide varies in hue and transparency, depending on hydration and slight impurities. Indian Red is a slightly duller, deep brick hue with a bluish undertone. It is very dense and opaque, with excellent tinting strength and covering power. It is dependable when mixing with all other permanent pigments and yields good flesh tints when mixed with Zinc White. It is the synthetic version of PR102, which is a pigment made from earth reds, or natural red iron oxides, and the names applied to PR101 and PR102 often overlap. The synthetic red iron oxides have mostly replaced natural red iron oxides and are brighter, stronger, finer, and more permanent. Indian Red is the highest grade bluish shade. Light Red, English Red, and Venetian Red are yellowish shades. Mars Violet is a dull and subdued bluish or purplish oxide.

Permanence

Red iron oxide is very lightfast with excellent permanence.

Toxicity

Red iron oxide has no significant hazards.

History

Natural red iron oxide comes from the mineral ore hematite, called bloodstone by the ancient Greeks from the word hema, meaning blood. It is one of the oldest pigments, has been used by every major civilization, and was an important mineral for medieval alchemists. It was not widely used in artists' materials until the 17th century and was not produced in large quantities until the 18th century.