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    Tavush Transparent Green Earth Pigment

Tavush Transparent Green Earth Pigment

423-20


Availability: In stock

Processing time: Usually ships within 24 hours.

Quick Overview

Tavush Transparent Green Earth is a green earth (glauconite) pigment from mineral deposits in Armenia.

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Image Product Name Price Safety Shipping Qty
Tavush Transparent Green Earth 100g
$9.50

Details

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.

Pigment Names
Common Names: English: green earth
French: terre verte
German: Grünerde
Italian: terre verde
Spanish: terra verde
Mineral Names: English: glauconite
French: glauconite
German: Glauconit, Glaukonit
Italian: glauconita
Spanish: glauconita

Origin and History

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.

Particle Size

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.

Permanence and Compatibility

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.

Oil Absorption and Grinding

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.

Toxicity

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

Pigment Information
Color: Green
Color Index: Pigment Green 23 (77009)
Chemical Name: Hydrated Iron Potassium Silicate
Chemical Formula: (K,Na)(Fe3,Al,Mg)2(Si,Al)4O10(OH)2
ASTM Lightfastness Rating
Acrylic: I
Oil: I
Watercolor: I
Properties
Oil Absorption: 28g oil / 100g pigment
Bulk Density: 0.72g/cm3
Hardness:
Refractive Index:
pH: 8.0
Heat Stability: 320° C
Water Solubility: < 0.18%
Ash: < 2.75%
Compaction Factor: 1.31
Chemical Composition
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
Trace Minerals 2.78

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