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Rublev Colours Tavush Transparent Green Earth is a greenish mineral of hydrated iron potassium silicate containing small amounts of aluminum, calcium, magnesium, sodium, and numerous trace elements. It is a bright green mineral that looks like tiny flakes of the mineral mica, or small lumps of clay. The color of glauconite varies considerably from pale green, bright green, bluish-green, olive-green, and black-green, depending upon its constituent elements. Rublev Colours Tavush Transparent Green Earth is from the Tavush deposits of Armenia.
|Common Names:||English: green earth
French: terre verte
Italian: terre verde
Spanish: terra verde
|Mineral Names:||English: glauconite
German: Glauconit, Glaukonit
The word glauconite is derived from the Greek word glaucos, originally meaning gleaming, later bluish green, and then silvery or gray. It has been in painting since ancient times. Restorers have proved through X-ray diffraction that the famous pigments of past centuries known as Veronese and Bohemian terre verte are in essence glauconite.
The particle size composition of Tavush Transparent Green Earth 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.
Green Earth 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.
This pigment is easy to grind in vegetable drying oils and water. The oil absorption value (OAV) is 28 grams of linseed oil for 100 grams of pigment.
The pigment is considered non-toxic, but care should always be exercised when handling the dry powder pigment so as not to inhale the dust.
Rublev Colours Pigment: Tavush Green Earth
|Color Index:||Pigment Green 23 (77009)|
|Chemical Name:||Hydrated Iron Potassium Silicate|
|ASTM Lightfastness Rating|
|Oil Absorption:||28g oil / 100g pigment|
|Heat Stability:||320° C|
|Water Solubility:||< 0.18%|
|Silicon Dioxide (SiO2)||63.66|
|Aluminum Oxide (Al2O3)||16.36|
|Titanium Dioxide (TiO2)||0.69|
|Iron Oxide (Fe2O3)||7.08|
|Manganese Oxide (MnO)||0.09|
|Calcium Oxide (CaO)||2.32|
|Magnesium Oxide (MgO)||1.81|
|Chromium Oxide (Cr2O)||–|
|Potassium Nitrate (K2O.N2O3)||5.20|