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Natural Pigments Roman Black 5 kg

SKU: NAP-481-135K
Natural Pigments Roman Black 5 kg
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 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 
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Product description

Details
Series 1

A natural brownish-black earth that is a dense, opaque, heavy color that is absolutely permanent. Black earths of Rome and Venice are mentioned by writers, such as De Mayerne. Roman black earth (Terra nera di Roma) is described by Salter as producing ‘the same effect as charcoal black’. It is comparatively warm to neutral in undertone, wets easily, and is non-greasy, when compared to carbon blacks. It is a useful pigment when these qualities are required.

Pigment Names
Common Names: English: black oxide
French: oxyde noir
German: Oxid Schwarzes
Italian: ossido nero
Japanese: 酸化物黒
Portuguese: óxido preto
Spanish: óxido negro
Alternate Names: English: black earth, black ocher, black ochre, black iron oxide, iron oxide
French: fer oxydé, naturelle noir Indien
Italian: terra nera di Roma

Mars black is the name given to the artificial substitute of natural black oxide.
Origin and History

Black oxide is a recent development in modern pigments and was not often encountered in artists' palettes before the 19th century. However, black earths that are mixtures of iron oxide, manganese oxide and carbon have been in use since Antiquity.

Source

The source of natural black oxide usually is from an iron ore called magnetite. Magnetite, also known as lodestone, is a ferrous ferric oxide (ferrosic oxide) that is a heavy, black color and opaque. Theoretically, black iron oxide contains slightly more iron metal than red oxide but not nearly as much as yellow oxide. The native mineral may contain varying amounts of manganese, sulfur, clay and silica.

Permanence and Compatibility

Natural black oxide is absolutely permanent colors for all uses on 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

Natural black oxide absorbs a moderately low amount of oil. The oil absorption ratio is 20–25 parts by weight of linseed oil to 100 parts by weight of pigment. If the measurement were grams, it would require 20–25 grams (by weight) of linseed oil to grind 100 grams (by weight) of pigment to form a stiff paste. It makes an average drying oil paint, and forms a hard, fairly flexible film.

Toxicity

Natural black oxide is not considered toxic, but care should be used in handling the dry powder pigment to avoid inhaling the dust.

Rublev Colours Pigment: Roman Black
Rublev Colours Pigment: Roman Black

Pigment Information
Color: Black
Colour Index: Pigment Black 11 (77499)
Chemical Name: Iron oxide produced from magnetite ore
Chemical Formula: Fe3O4
ASTM Lightfastness Rating
Acrylic: I
Oil: I
Watercolor: I
Properties
Density: 5.15
Hardness: 5.5–6.0
Refractive Index: n=2.42




Specifications:

Color Index: Pigment Black 11 (77499)
Chemical Name: Iron oxide produced from magnetite ore
Acrylic: I
Oil: I
Watercolor: I
Density: 5.15
Hardness: 5.5–6.0
Refractive Index: n=2.42



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: 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.
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Roman Black 5 kg




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