Warm Red Ochre

Product Details:

100 g jar (3.5 oz)
Warm red ochre is a natural earth containing clay tinted by hydrated iron oxide that gives an exceptionally warm orange-red hue. Our warm red ochre, like French ochre, historically one of the best grades, contains about 20% iron oxide and is high in silica. Warm red ochre is obtained from iron ore deposits near Serpukhov, Russia.

Pigment Names
Alternate Names:	Mars Red is the name given to the synthetic precipitated form of hydrated iron oxide.

Origin and History
Ochre has been used as a pigment since prehistoric times and is perhaps the most widely used pigment for artists paints.

Source
Ochre is a natural earth containing clay tinted by hydrated iron oxide and is composed of a naturally calcined form of limonite and goethite, and traces of gypsum or manganese carbonate. Limonite is a general term used to describe all forms of hydrated iron oxide minerals (FeO(OH)) that occur as natural clay or earth. Limonite includes the minerals goethite, akaganeite and lepidocrocite. To be considered an ochre, the content of iron oxide must not be less than 12%. Depending upon the content of hydrated iron oxide, the color of ochre varies from light yellow to orange-red. Most yellow ochre are normally not calcined as heat does relatively little to alter their color. Like red iron oxides (hematite), they are found around the world and have been used as pigments since prehistory. French ochre, historically one of the best grades of limonite, contains about 20% iron oxide and is high in silica. In the former Soviet Union, high quality ochre can be obtained from the Izyumskyy deposit in Ukraine, and the Zhuravskoye, Skarnovskoye and Dubovikovskoye deposits in the Voronezh region, and the Lyubytinskoye deposit near Novgorod.

Permanence and Compatibility
Ochre is among the most permanent colors among the artist's palette. It is compatible with all other pigments, and can be used with good results in all mediums.

Oil Absorption and Grinding
Ochre absorbs a medium amount of oil. It slows the drying of oil paint, but forms an excellent film.

Toxicity
Ochre is not considered toxic, but care should be used in handling the dry powder pigment to avoid inhaling the dust.


Pigment: Warm Red Ochre

Pigment Information
Color:	Orange Red
Colour Index:	Pigment Red 101 (77491)
Chemical Name:	Hydrated Iron Oxide
Chemical Formula:	Fe2O3 • H2O
ASTM Lightfastness Rating
Acrylic:	I
Oil:	I
Watercolor:	I
Properties
Density:	2.9–4.3
Hardness:	4.0–5.5
Refractive Index:	2.260–2.398

Read cautions about handling pigments

Availability: Usually ships within 24 hours.