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ArtistSupplySource.com » Painting & Painting Accessories » » » Natural Pigments Chromium Oxide Green 500 g - Color: Green
 

Natural Pigments Chromium Oxide Green 500 g - Color: Green

SKU: NAP-427-1550
Natural Pigments Chromium Oxide Green 500 g - Color: Green
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 1   US$ 57.63 
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 3   US$ 57.08 
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Product description

Details
Chromium oxide green, also known as chromium sesquioxide or chromia, is one of four oxides of chromium, chemical formula Cr2O3. It is commonly called chrome green when used as a pigment; however it was referred to as viridian when it was first discovered.

Pigment Names
Synonyms: chromia, chrome green, chromium sesquioxide, viridian

Origin and History
The element chromium was found in lead chromate in 1797 by Louis-Nicolas Vauquelin. The name chromium was given to the element because so many colored compounds can be produced from it. As early as 1809, chromium oxide was being used as an enamel in porcelain factories, but it was not yet used as a painting pigment. It has been written by several sources that chromium oxide was not used as a pigment until 1862, but there is evidence to suggest that it was used earlier. The pigment has been identified on a J.M.W. Turner painting which dates back to 1812. An 1815 journal entry by George Field included a homemade example of the pigment, and in 1831 Vergnaud discussed two different preparation methods, but said that the pigment was not widely used because of its high price. A catalogue of pigments printed around 1840 lists a green oxide of chromium, which is believed to be chromium oxide. Also, in 1969 Kühn, using microscopy and emission spectroscopy, found chromium oxide in three paintings which dated between 1845 and 1850. It is widely accepted that chromium oxide was used before the hydrated version. Their use has been limited, though, since these greens are much more expensive than the emerald greens or chrome greens, due to the preparation process. It is sometimes used to make lightfast paints when mixed with yellows. In the past it was used in automotive finishes and to make bank notes.

Source
The first man to prepare chromium oxide was Pannetier in Paris, but his process was kept hidden. Guignet invented a two-step process for preparing the chemical. His first step was to heat boric acid and potassium bichromate, a process known as calcining, which produced a porous mass. The second step produces hydrated oxide, boric acid, and some boron, after the mass is washed in cold water, or hydrolyzed. This is only one way of several for the preparation of chromium oxide. There is no specific chemical composition for hydrated chromium oxide since different preparation processes produce the chemical with boron, while other processes produce the chemical without boron.

Permanence and Compatibility
Hydrated chromium oxide is permanent, but chromium oxide is more stable and is one of the most permanent pigments an artist uses. It will not react with hydrochloric acid or with sodium hydroxide.

Oil Absorption and Grinding
Chromium oxide green absorbs a small amount of oil (26 g oil per 100 g of pigment).

Toxicity
Though chomium oxide green is not a serious health hazard, it can cause irritation of the skin and eyes, and can cause nausea and other problems if ingested. It also can cause respiratory problems when dust is inhaled. It is not a fire hazard, and does not readily react with other materials.

Pigment: Chromium Oxide Green
Pigment: Chromium Oxide Green

Pigment Information
Color: Green
Colour Index: Pigment Green 17 (77288)
Chemical Name: Chromium Oxide
Chemical Formula: Cr203
ASTM Lightfastness Rating
Acrylic: I
Oil: I
Watercolor: I
Properties
Density: 5.21 g/cm3
Hardness: -
Refractive Index: -
Oil Absorption: 26 g oil/100 g pigment






Specifications:

Color: Green
Color Index: Pigment Green 17 (77288)
Chemical Name: Chromium Oxide
Acrylic: I
Oil: I
Watercolor: I
Density: 5.21 g/cm3
Oil Absorption: 26 g oil/100 g pigment



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: 1.10 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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Chromium Oxide Green 500 g
Pigment: Chromium Oxide Green




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