Gold Ocher (4 oz )

Product Details:

4 oz jar

Gold ocher is a natural yellow earth containing clay tinted by hydrous forms of iron oxide. Our gold ocher from deposits in Voronezhskaia oblast (region) of Russia is similar to French yellow ocher both in hue and transparency. Rublev Colours Gold Ocher, consisting primarily of the mineral goethite, is made by Natural Pigments into a fine grade pigment (small particle size) with a high kaolin content.

Pigment Names
Common Names:	English: gold ocher French: ocre or German: Ocker gold Italian: ocra dell'oro Russian: охра желтая Spanish: ocre dorado
Synonyms:	Goethite, limonite, raw sienna, yellow earth, yellow ocher, yellow iron oxide, yellow hydrated oxide and iron hydroxide pigment
Alternate Name:	Mars yellow is the name given to the synthetic form of yellow iron oxide hydroxide.

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

Source
Yellow ocher is a natural earth containing clay tinted by hydrous forms of iron oxide, such as goethite, and traces of gypsum or manganese carbonate. Historically, yellow ocher was designated by the mineral name limonite. Limonite, however, is not a true mineral, but a general term used to describe all forms of hydrated iron oxide minerals (α-FeOOH) that occur as natural earth. Limonite includes the minerals goethite, akaganeite and lepidocrocite. To be considered an ocher, the content of iron oxide must not be less than 12% with varying amounts of kaolin and quartz. Depending upon the content of hydrated iron oxide, the color of ocher varies from light yellow to golden. Like red iron oxides (hematite), they are found around the world and have been used as pigments since prehistory. French ocher, historically one of the best grades of ocher, contains about 20% iron oxide and is high in silica. In Russia, high quality ochers 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
Ocher 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
Ocher absorbs a medium amount of oil. It slows the drying of oil paint, but forms a good film.

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


Pigment: Gold Ocher

Pigment Information
Color:	Yellow
Colour Index:	Pigment Yellow 43 (77492)
Chemical Name:	Iron Oxide Hydroxide
Chemical Formula:	α-FeOOH
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

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