Great American Handmade Pastel - SOM Scarab 3, 815.3

Item #:21925-8703
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Som Scarab 3
Som Scarab 3

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Product Details

Color:
SOM Scarab 3
No.
815.3

Pigment Information

This color contains the following pigments:

PW18-Calcium Carbonate

PR210-Naphthol Red Medium

PBr7-Burnt Umber


Pigment Name

PW18-Calcium Carbonate

Pigment Type

inorganic

Chemical Name

calcium carbonate

Chemical Formula

CaCO3

Properties

Calcium carbonate, the mineral constituent of chalk, is a low tinting strength, inexpensive white pigment that is often used is a buffer and filler. Because of its low tinting strength, it is overwhelmed by other colors. It is used in gesso and other coatings to give the surface more tooth, a desirable characteristic for some painting techniques.

Permanence

Calcium carbonate is lightfast. Like all carbonates, it reacts with strong acids

Toxicity

Calcium carbonate is completely non-toxic, and is used in many food, cosmetic, and pharmaceutical products. However, excessive consumption is not recommended. 

History

Naturally occuring chalk deposits have been mined since prehistoric times. Rocks and minerals that contain calcium carbonate include aragonite, calcite, vaterite, chalk, limestone. marble, and travertine. Calcium carbonate is the principle component of lime, used in many agricultural and industrial applications.


Pigment Name

PR210-Naphthol Red Medium

Pigment Type

organic, naphthol AS

Chemical Formula

Properties

Pigment PR210 is a semi-transparent, bluish red pigment.

Permanence

Pigment PR210 has very good lightfastness, but its performance is considered inferior to PR170, another naphthol red.

Toxicity

Naphthol Reds are not considered toxic. They may cause eye, skin, or respiratory irritation. Contact with dry pigment should be avoided.

History

Pigment PR210 is used primarily in inks and waterbased paints.


Pigment Name

PBr7-Burnt Umber

Pigment Type

earth

Chemical Name

iron oxides with manganese silicates or dioxide

Chemical Formula

Fe2O3,MnO2 or Fe2O3 + MnO2 + nH2O + Si + Al2O3

Properties

Burnt Umber is a more intense reddish brown pigment that results from heating the clay pigment Raw Umber. It has medium to excellent tinting strength and high opacity, and it is quick drying in oil form. Burnt Umber is somewhat more transparent than Raw Umber. It has excellent color properties and can create a variety of subtle, clear tints when mixed with white. It can tend towards chalkiness in dark mixes in oil form, but overall it mixes well with other colors. To create a black color in oil form, mix Burnt Umber with Phthalo Blue or Ultramarine. To achieve a similar color in watercolor form, mix it with Ultramarine or Payne's Gray.

Permanence

Burnt Umber has good permanence.

Toxicity

Burnt Umber itself is considered non-toxic. If contaminated by manganese compounds, it may be highly toxic if inhaled and moderately toxic if ingested.

History

This pigment gets its name from the Latin word umbra, meaning shadow or shade. Its full name is listed as terra di ombra, meaning earth of shadow/shade, due to its original extraction from the area of Umbria, Italy. It has been used as a pigment since prehistoric times. Currently, the finest umber comes from Cyprus.


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