Color Swatch created using heavy application/diluted application and was applied on cold press watercolor paper (150 lb) material.
This color contains the following pigments:
PG19—Cobalt Green
Pigment Type
n/a
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.
Alternate Names
Green Smalt, Rinmann’s Green, Swedish Green, Zinc Green. Gellert Green is a similar variety, though it is made using a slightly different process.
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.
Alternate Names
Cobalt Teal, Cobalt Turquoise, Light Green Oxide
PG26—Cobalt Green Deep
Pigment Type
inorganic
Chemical Name
Cobalt chromium oxide
Chemical Formula
n/a
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.
Alternate Names
n/a
