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Natural Pigments Cobalt Yellow (Aureolin) 50 g - Color: Yellow

SKU: NAP-437-1005
The minimum order amount for this product line is $30.00
Natural Pigments Cobalt Yellow (Aureolin) 50 g - Color: Yellow
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 1   US$ 23.69 
 2   US$ 23.55 
 3   US$ 23.46 
 4-5   US$ 23.41 
 6-7   US$ 23.32 
 8-11   US$ 23.26 
 12+   US$ 23.18 
 
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Product description

Details
Cobalt yellow (commonly called aureolin) is a potassium or sodium-substituted potassium cobalt nitrite. The compound was discovered in 1831 but not introduced as a pigment until after 1851. It is an intense yellow that has high tinting strength and low opacity. It is an expensive pigment sold by several manufacturers of artists' oil paints. However, the pigment never gained much popularity as an oil color and was much more widely available as a watercolor.

Water-Based Paint
In watercolors, cobalt yellow darkens and fades. It is a transparent, lightly staining, light valued, intense yellow pigment.

Oil Paint
In oil paint, cobalt yellow is transparent color with good tinting strength and is considered to be permanent.

Color Names
Current Names: Dutch: kobalt geel
English: cobalt yellow
French: jaune de cobalt
German: Kobaltgelb
Italian: giallo di cobalto
Spanish: cobalto amarillo


Origin and History
The history of cobalt yellow pigment has been well documented by M. Cornman in 'Cobalt Yellow (Aureolin),' Artists' Pigments. A Handbook of their History and Characteristics, Volume 1, National Gallery of Art (1986). It is generally understood that cobalt yellow was first synthesized by N.W. Fischer in 1831 as part of his study of nitrite salts. However, Fischer did not describe the compound specifically until 1848. Meanwhile, Saint-Evre, working in Paris, independently rediscovered the compound around 1851 and introduced it as a pigment. It first appeared in Windsor & Newton's catalogs in 1861. According to Gettens and Stout, the pigment was reputedly made popular by the American watercolorist Aaron Penly and the German artist Arthur Mühlberg.

Source
According to Cornman, the principal method of preparing cobalt yellow was by mixing together solutions of cobalt salts with acetic acid followed by the addition of a concentrated potassium nitrite solution. Cobalt yellow would then slowly precipitate as a yellow crystalline mass.

Permanence and Compatibility
Cobalt yellow is slightly soluble in water and is darkened when mixed with sodium sulfide and caustic soda. In admixtures with organic pigments, such as lakes of cochineal, indigo, etc., it causes the decomposition of these; the organic colors become altered in hue and cobalt yellow becomes a brownish hue.

Oil Absorption and Grinding
Cobalt yellow absorbs a moderately high amount of oil; about 55 grams of linseed oil per 100 grams of pigment to make a paste. It has been noted in some manuals that the pigment works better as a watercolor than it does in oil, and is highly valued on that account among moist colors used by artists. According to Uebele it requires six parts of oil to four parts of the dry color on mixing and grinding.

Toxicity
Cobalt yellow is considered slightly toxic, and hence care should be used in handling the dry powder pigment to avoid inhaling the dust. Soluble cobalt compounds as well as cobalt metal may have a sensitizing effect. However, none have been reported during the experience of many years of handling cobalt yellow pigments.


Rublev Colours Pigment: Cobalt Yellow (Aureolin)

Pigment Information
Color: Yellow
Color Index: Pigment Yellow 40 (77357)
Chemical Name: Hydrated Tripotassium Hexanitrocobalt(II)
Chemical Formula: K3(Co(NO2)6).nH2O
CAS: 13782-01-9
ASTM Lightfastness Rating
Acrylic: II
Oil: II
Watercolor: II
Properties
Specific Gravity:
Refractive Index:
Oil Absorption: 55 g oil/100 g pigment






Specifications:

Color: Yellow
Color Index: Pigment Yellow 40 (77357)
Chemical Name: Hydrated Tripotassium Hexanitrocobalt(II)
CAS Number: 13782-01-9
Acrylic: II
Oil: II
Watercolor: II
Oil Absorption: 55 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: 0.11 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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Cobalt Yellow (Aureolin) 50 g




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