Great American Handmade Pastel - Pearlescent Verdigris, 322

Item #:21925-1850
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Pearlescent Verdigris
Pearlescent Verdigris
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Product Details

Color:
Pearlescent Verdigris
No.
322

Pigment Information

This color contains the following pigments:

PW18-Calcium Carbonate

PW20-Mica

PB36-Cobalt Chromite Blue Green Spinel


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

PW20-Mica

Pigment Type

inorganic

Chemical Name

aluminum silicate

Chemical Formula

H2KAl3(SiO4)3

Properties

An off-white pigment with complex reflective effects, mica is often used with transparent pigments to create mixed pigments with interference and pearlescent effects.

Permanence

Mica is permanent and lightfast.

Toxicity

Although it is completely non-toxic and not bioreactive, fine particles may be irritating. This is of concern primarily for those exposed occupationally to dry mica powder. Breathing mica particles may cause lung fibrosis and pneumoconiosis.

History

Mica has been used as a pigment since prehistoric times.


Pigment Name

PB36-Cobalt Chromite Blue Green Spinel

Pigment Type

inorganic

Chemical Name

Oxides of Cobalt and Chromium

Chemical Formula

Co(Al,Cr)2O4

Properties

Cobalt Chromite Blue is an opaque pigment with moderately low tinting strength.

Permanence

Cobalt salts have excellent lightfastness and temperature stability.

Toxicity

Cobalt salts are toxic when ingested or inhaled, and slightly toxic on contact with the skin. Evidence of Chromium(III) carcinogenicity is inconclusive. Chromium(III) salts appear in greenish pigments.

History


Safety Data Sheet