Hrazdan Yellow Ocher Pigment

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SKU
433-24

A yellow iron oxide earth pigment from a natural mixture of minerals from deposits in Armenia. Learn more.

Rublev Colours Hrazdan Yellow Ocher is a yellow iron oxide earth pigment from a natural mixture of minerals from the Kotayk deposits of Armenia. Yellow ocher is not a true mineral but a mixture of similar hydrated iron oxide minerals.

Pigment Names
Common Names: English: yellow ocher
French: ocre jaune
German: Ockergelb
Italian: giallo ocra
Spanish: amarillo ocre

Origin and History

Known since antiquity, yellow ocher is from a natural mineral composing the pigment known as ocher (okhra in Greek). Ocher has been used as a pigment since prehistoric times and is perhaps the most widely used pigment for artists' paints.

Particle Size

The particle size composition of Armenian Gold Ocher is 80–85% from sub-0 to 15 microns with the remainder ranging up to 30 microns with only 0.1% at 30 microns and above.

Permanence and Compatibility

Yellow ocher is among the most permanent colors among the artists' palette. It is compatible with all other pigments, and can be used with good results in all mediums.

Oil Absorption and Grinding

This pigment is easy to grind in vegetable drying oils and water. The oil absorption value (OAV) is 39.8 grams of linseed oil for 100 grams of pigment.

Toxicity

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

Rublev Colours Pigment: Armenian Gold Ocher

Rublev Colours Pigment: Hrazdan Yellow Ocher

Pigment Information
Color: Yellow
Color Index: Pigment Yellow 43 (77492)
Chemical Name: Iron Oxide Hydroxide
Chemical Formula: a-FeOOH
ASTM Lightfastness Rating
Acrylic: I
Oil: I
Watercolor: I
Properties
Oil Absorption: 39.8g oil / 100g pigment
Bulk Density: 0.84g/cm3
Hardness:
Refractive Index:
pH: 7.0
Heat Stability: 170° C
Water Solubility: < 0.40%
Ash: < 0.63%
Compaction Factor: 1.31
Chemical Composition
Silicon Dioxide (SiO2) 50.10
Aluminum Oxide (Al2O3) 20.45
Titanium Dioxide (TiO2) 1.26
Iron Oxide (Fe2O3) 10.56
Manganese Oxide (MnO)
Calcium Oxide (CaO) 1.83
Magnesium Oxide (MgO) 1.14
Chromium Oxide (Cr2O)
Potassium Nitrate (K2O.N2O3) 6.71
Trace Minerals 7.95
More Information
SKU433-24
BrandRublev Colours
VendorRublev Colours
Processing TimeUsually ships the next business day.
ColorYellow
Pigment TypeInorganic, Natural

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Hrazdan Yellow Ocher Pigment
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