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.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: Hrazdan Yellow Ocher