Shipping & Delivery  |  Safe & Secure Shopping  |  About Us  |  Contact Us Place order online or call   1-800-929-2431
Home page
   
0
Product search
Up

ArtistSupplySource.com » Painting & Painting Accessories » » » Natural Pigments Verona Green Earth 5 kg - Color: Green
 

Natural Pigments Verona Green Earth 5 kg - Color: Green

SKU: NAP-421-265K
Natural Pigments Verona Green Earth 5 kg - Color: Green
Discount table
Qty Price
 1   US$ 187.21 
 2   US$ 186.09 
 3   US$ 185.43 
 4-5   US$ 184.96 
 6-7   US$ 184.31 
 8-11   US$ 183.84 
 12+   US$ 183.18 
Price: US$ 187.21
Quantity:
 
 
 
Subtotal:
US$ 187.21


SSL seal



Product description

Details
Verona green earth is the natural mineral glauconite, 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. Our Verona green earth is from deposits in northern Italy near the famous sources of Veronese green earth.

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.

Source
Green earth, also widely known as terre verte, is primarily composed of the minerals celadonite and glauconite. The presence of celadonite or glauconite, minerals of complex silicate composition, produces colors that vary from cold bluish greens to warmer yellow and olive hues. It may have been formed originally from biotite (a dark-colored mica), but other minerals, and even organic matter, may change it into glauconite. The mineral has a micaceous structure, that is, a silicate crystallized in monoclinic forms that readily separates into very thin leaves. It is characteristically formed on submarine elevations of ancient seabeds ranging in depth from 30 to 1,000 meters (100 to 3,300 feet) below sea level, and in the sedimentary rocks of different geological systems. Usually it forms small (from 0.8 to 1.5 mm in diameter) green round or angular grains.

The most famous deposit of green earth was found near Verona, Italy, and this mine was active until World War II. Other mines produced variations in color and texture of the pigment: Baltic states, Bohemia, Cypress, France, Hungary, Poland, Saxony, Tyrol, and the Mendip hills of England. Our green earth is from from open mines near Mt. Baldo, Italy.

Preparation and Alteration
Glauconite is not found in nature as large accumulations, but rather in combination with clay or sand. Its content rarely exceeds 50% of the deposit, making it necessary to process the mineral for use as a pigment. The preparation of glauconite is usually done with levigation, sifting and sometimes electromagnetic separation. Sometimes clay or sandy minerals, tinted with aniline red or copper pigments, have been marketed under the guise of glauconite. Ethyl alcohol can be used to detect the presence of aniline red, while mixing a sample with ammonium hydroxide can reveal the presence of copper-based colors.

Use in Painting
Green earth pigments were often used by medieval artists for flesh undertones. This green underpainting neutralized the effect of the pinks and reds of the flesh colors. On the color wheel, the hue of green earth is the approximate complement to the pink used by medieval painters. Complementary colors neutralize each other, and this neutralization was important for medieval painters because of the materials they worked with. Paint pink and red tones of flesh directly onto white gesso would achieve a "sunburn" effect in the flesh of the figures. To neutralize the pink, painters painted a layer of green earth under the pink. The light would pierce the pink layer, then the green, and reach the white. White reflects all light colors, so the light is reflected back through the paint. Each color paint absorbed some colors, or wavelengths, of the light. Thus, as the light passed back through the paint to the viewer, the flesh tones appeared neutral.

Permanence and Compatibility
Earth pigments, and green earths in particular, are often described as the most permanent of colors. Earths are not affected by sunlight or by atmospheric conditions. They do not react with solvents, but according to Feller, green earth is partially soluble in acids and alkalis.

Oil Absorption and Grinding
Green earths have reasonable tinting strength and covering power, and the pigment is easily ground. Since it contains some clay, green earth absorbs oil at a moderate to high rate.

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.

Pigment: Glauconite, Verona Green Earth
Pigment: Verona Green Earth (Glauconite)

Pigment Information
Color: Green
Colour 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: Not Rated
Properties
Density: 2.2–2.9
Hardness: 2.0–3.0
Refractive Index: 1.551–1.569






Specifications:

Color: Green
Color Index: Pigment Green 23 (77009)
Chemical Name: Hydrated Iron Potassium Silicate
Acrylic: I
Oil: I
Watercolor: Not rated
Density: 2.2–2.9
Hardness: 2.0–3.0
Refractive Index: 1.551–1.569



Natural Pigments

Natural Pigments is a limited liability company based in Willits, California. We manufacture and distribute rare and hard-to-find materials for fine artists and decorators. We specialize in supplying artists' materials that were used in historical painting since pre-historic times up to and including the nineteenth century.

We constantly search for materials and products of the finest quality so that we can bring them direct to you from the source. To do so, we travel the world to find materials specifically for use by professional artists and decorators. We obtain minerals from mines in Afghanistan, Chile, Russia, Ukraine and Uzbekistan, to name a few places, processing these into natural pigments. We purchase resins, gums and plants from India, Kenya and Malaysia to make natural varnishes and painting mediums.

Our mission is to provide the largest variety of natural pigments, paints and other professional artists' supplies, enabling us to bring you a selection that makes shopping for rare and hard-to-find art materials easy. Our objective is to promote the education and use of these materials among artists by providing detailed information for their employment in encaustic, fresco, oil, watercolor and tempera painting.
All Natural Pigments products


Product weight: 11.00 lbs
 

This product is shipped from our warehouse in Gretna, NE, USA.
This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
Please submit your product question using this form. All fields are required.

Your First name: *
Your email: *
Your phone: *
Product question:
Please don't mention your email and your phone in this field.
*
Submit question

Detailed images
Verona Green Earth 5 kg
Pigment: Glauconite, Verona Green Earth




Brands:  0-9  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z All Natural Pigments products

Web Orders
24 hours a day, 7 days a week

Email Support
Contact Us

Telephone Customer Service
Mon-Fri: 9 a.m. to 5 p.m. EST
Toll Free: 1-800-929-2431
Tel: (616) 259-5711
Fax: (813) 944-4516



USA Address
S3 Stores, Inc.
2885 Sanford Ave SW #12717
Grandville, MI 49418
USA

Canadian Address
S3 Stores, Inc.
27 Joseph St.
Chatham, Ontario N7L 3G4
Canada

Payment Methods
We accept all major credit cards
Purchase Orders
Combating eCommerce Fraud
Copyright © 2005-2016 S3 Stores Holdings, Inc. All Rights Reserved.   Terms of Use | Privacy Policy