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ArtistSupplySource.com » Painting & Painting Accessories » » » Natural Pigments Ambrogio Yellow Earth 100 g - Color: Yellow
 

Natural Pigments Ambrogio Yellow Earth 100 g - Color: Yellow

SKU: NAP-431-4410
The minimum order amount for this product line is $30.00
Natural Pigments Ambrogio Yellow Earth 100 g - Color: Yellow
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 1   US$ 9.45 
 2   US$ 9.39 
 3   US$ 9.36 
 4-5   US$ 9.34 
 6-7   US$ 9.30 
 8-11   US$ 9.28 
 12+   US$ 9.25 
 
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Product description

Details

Series 2

Ambrogio Yellow Earth is a natural iron oxide hydroxide mineral (goethite) from quarries in northern Italy. It is a deep golden yellow that is semi-transparent, permanent and works well in all mediums.

Pigment Names
Common Names: English: yellow earth
French: terre jaune
German: Masse gelb
Italian: terra giallo
Spanish: tierra amarillo
Synonyms: Goethite, limonite, raw sienna, yellow earth, yellow ocher, yellow iron oxide, yellow hydrated oxide and iron hydroxide pigment
Alternate Name: Mars yellow is the name given to the synthetic form of yellow iron oxide hydroxide.


Origin and History
Known since the antiquity, iron oxide earth pigments occur naturally as yellow (goethite) or as red (hematite) earths. Yellow earths have been used as a pigment since prehistoric times and is perhaps the most widely used pigment for artists paints.

Source
Ambrogio Yellow Earth is a natural earth containing clay tinted by hydrated iron oxide and is composed of goethite and traces of clay, gypsum or manganese carbonate. It comes from quarries located near Sant'Ambrogio di Valpolicella, a municipality in the northern Italian province of Verona in the region of Veneto.

Historically, yellow earth was designated by the mineral name limonite. Limonite, however, is not a true mineral, but a general term used to describe all forms of hydrated iron oxide minerals (α-FeOOH) that occur as natural earth. Limonite includes the minerals goethite, akaganeite and lepidocrocite. The names for yellow iron oxide pigments are confusing. The names earth and ocher are suitable when it is clear that the pigment comes from a natural source. Earth is a more general term, since ocher refers to a specific type of iron oxide deposit containing kaolin (clay) and quartz. To be considered an ocher, for example, the content of iron oxide must not be less than 12%. Depending upon the content of hydrated iron oxide, the color of ocher varies from light yellow to orange-red. Like red iron oxides (hematite), they are found around the world and have been used as pigments since prehistory. French ocher, historically one of the best grades of limonite, contains about 20% iron oxide and is high in silica.

Yellow earth grades into sienna, a yellow-brown pigment containing a higher percentage of iron ore than yellow earth as well as some manganese dioxide. Sienna grades into umber, which is darker brown and contains a higher percentage of manganese dioxide. Burnt sienna is brown or bright red, burnt umber is a darker brown than umber.

Yellow earth is not naturally usable as a pigment and therefore needs to undergo several important processes, such as:

  • Extract ore from the quarries.
  • Separate yellow earth from sand using water and centripetal force.
  • Blend different yellow earth extracted from diverse veins to obtain the selected colors.
  • Grind to 50 microns and pack.

Permanence and Compatibility
Yellow earth is among the most permanent colors among the artist's palette. It is compatible with all other pigments, and can be used with good results in all mediums.

Oil Absorption and Grinding
Yellow earth absorbs a moderately high amount of oil. The oil absorption ratio is 30–45 parts by weight of linseed oil to 100 parts by weight of pigment . If the measurement were grams, Ambrogio Yellow Earth would require 30–45 grams of linseed oil to grind 100 grams of pigment to form a stiff paste. It slows the drying of oil paint, but forms an excellent film.

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

Rublev Colours Pigment: Ambrogio Yellow Earth
Rublev Colours Pigment: Ambrogio Yellow Earth

Pigment Information
Color: Yellow
Colour Index: Pigment Yellow 43 (77492)
Chemical Name: Iron Oxide Hydroxide
Chemical Formula: α-FeOOH
ASTM Lightfastness Rating
Acrylic: I
Oil: I
Watercolor: I
Properties
Density: 2.9–4.3
Hardness: 4.0–5.5
Refractive Index: 2.260–2.398







Specifications:

Color: Yellow
Color Index: Pigment Yellow 43 (77492)
Chemical Name: Iron Oxide Hydroxide
Acrylic: I
Oil: I
Watercolor: I
Density: 2.9–4.3
Hardness: 4.0–5.5
Refractive Index: 2.260–2.398



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.
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Product weight: 0.22 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.
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Ambrogio Yellow Earth 100 g




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