Old Holland Classic Artist Watercolor - Cobalt Green Turquoise, 6 ml tube

Pigment Information

This color contains the following pigments:

PG50-Cobalt Green

PG26-Cobalt Green Deep

PG19-Cobalt Green

Pigment Name

PG50-Cobalt Green

Pigment Type

inorganic

Chemical Name

cobalt titanium oxide

Chemical Formula

Co2TiO4

Properties

Cobalt Titanium Oxide is a low intensity color with a weak tinting strength, similar to Cobalt Blue. It has an average to fast drying time.

Permanence

Cobalt Green has excellent permanence and lightfastness.

Toxicity

Cobalt Green  is considered toxic due to its cobalt component. Do not breathe its dust.

History

Since ancient times, smalt blue has been used to color glass and ceramics. Cobalt salts, which give smalt its characteristic blue color, were identified in the 18th century. Techniques for manufacturing various cobalt salts, offering a range of blues and greens, were developed in the 19th century.

Pigment Name

PG26-Cobalt Green Deep

Pigment Type

inorganic

Chemical Name

Cobalt chromium oxide

Properties

This pigment offers a deep but dull and opaque tone of Cobalt Green. It has moderate covering power, but low tinting strength. It is primarily for use on its own, or for mixing with other cobalt colors. It is an alternative to cobalt(II) zinc oxide, another form of Cobalt Green.

Permanence

Cobalt pigments are absolutely lightfast.

Toxicity

Cobalt chromium oxide is slightly toxic, and is a possible carcinogen.

History

Cobalt chromium oxide is an alternative Cobalt Green to the better known cobalt zinc oxide. Both pigments were used by landscape artists before phthalocyanine-based pigments became widely available in the 20th century.

Pigment Name

PG19-Cobalt Green

Chemical Name

cobalt(II)-oxide-zinc(II)-oxide

Chemical Formula

CoO • ZnO

Properties

Cobalt Green is a pure, fairly opaque, moderately bright bluish-green with a low tinting strength and limited hiding power. It makes valuable grays and muted, minimalistic greens when mixed with other pigments. However, it can brown at full strength and fade when mixed with lead based whites. It is quick drying in oil form and is not widely used because its hue can easily be matched by mixing green and blue pigments with superior painting properties. It is currently not in wide use.

Permanence

Cobalt Green is completely lightfast. Its permanence is excellent, so it can be used in all painting techniques.

Toxicity

Cobalt Green is moderately toxic if inhaled or ingested. It is slightly toxic if it comes into contact with skin.

History

Cobalt comes from the Middle High German word kobolt, an underground goblin, because miners thought cobalt harmed silver ores. In 1780, the Swedish chemist Sven Rinmann developed a process for making a compound of cobalt and zinc (zinc oxide). It was introduced as a pigment in 1835, but poor tinting strength and high cost kept it in limited use throughout the next centuries. It gained some popularity among 19th century landscape painters.