Apt Yellow Oxide Pigment

Apt Yellow Oxide is a yellow iron oxide pigment preparation derived primarily from natural yellow ochre from the Apt region of Vaucluse, France, and lightly adjusted with a small proportion of synthetic iron oxide for consistency. It presents a warm, earthy yellow with moderate opacity, low tinting strength, and excellent stability, making it suitable for traditional and contemporary painting practices. Its handling and permanence place it firmly within the long historical continuum of iron oxide earth pigments.

Origin and History

Yellow iron oxide pigments have been used continuously since prehistoric times and represent one of the oldest classes of artists’ materials. The Apt region of southern France, including Gargas and Rustrel, has been an important center for ochre extraction and processing for centuries. “Yellow Oxide of Apt,” later known as Oxy Apt jaune, refers to pigments prepared from these local ochres and refined for artistic use.

Source / Manufacture

Apt Yellow Oxide is prepared by washing, grading, and refining natural yellow ochre rich in goethite, followed by the addition of a small proportion of synthetic iron oxide to stabilize hue and performance. The resulting pigment is approximately 98% natural in origin. As with all earth pigments, final color and opacity are influenced by iron content, particle size distribution, and associated clay minerals.

Permanence and Compatibility

Iron oxide pigments are among the most chemically stable materials available to artists. Apt Yellow Oxide is resistant to light, moisture, and atmospheric pollutants, and is compatible with all common artists’ pigments and binders. It performs reliably in oil, acrylic, watercolor, tempera, fresco, and lime-based systems.

Oil Absorption and Grinding

This pigment exhibits moderately high oil absorption, typically in the range of 30–35 parts linseed oil per 100 parts pigment by weight. It grinds readily but benefits from thorough dispersion to achieve maximum opacity and uniformity. Like most iron oxides, it produces durable, flexible paint films.

Toxicity

Apt Yellow Oxide is not considered toxic in normal artistic use. Standard precautions should be observed when handling dry pigment, including minimizing dust generation and avoiding inhalation.

Pigment: Apt Yellow Oxide (Apt, Vaucluse, France)