
Detail of Cassatt pastel as seen through the microscope. The field of view is 3/4" in diameter.
Chalk & Pastel
By the early nineteenth century, commercially fabricated chalk had largely replaced mined natural chalk as a drawing material. Fabricated chalk is composed of powdered pigments and clay bound with a weak adhesive. Pastel, a soft form of fabricated chalk, was popularized in the eighteenth and nineteenth centuries, and brings to mind the brilliant painterly compositions by Edgar Degas and Mary Cassatt. Fabricated chalks, including pastel, are characterized by a velvety matte surface imparted by the densely deposited pigment; appearance can vary from distinct lines to areas of seamless blending. The detail at the left illustrates the velvety surface of pastel. First mentioned by Leonardo da Vinci in 1499, pastels were developed further during the sixteenth century and commercially manufactured by the eighteenth century when the taste for pastel portraiture became widespread. To produce pastels and fabricated chalks, pigments were typically combined with white clay, then formed into a paste with a dilute binder, rolled into sticks, and air-dried. Various binders have been used, but by the nineteenth century a plant gum (gum tragacanth) was referred to most frequently. In Mary Cassatt’s time, a richly colored palette of pastels, as well as papers and canvases prepared with highly textured surfaces, were available for purchase. The artist can blend the pastel with brushes, fingers, chamois, or a rolled paper stump.
Shown above from left to right are a pastel stick, rolled chamois, paper stump and brush.
Examples from the Collection

Bust of Female Figure, c. 1814
Pierre-Paul Prud'hon, French
Black and white chalks on blue wove paper
Sheet: 11 x 8 5/8 inches (27.9 x 21.9 cm)
The Henry P. McIlhenny Collection in memory of Frances P. McIlhenny, 1986
1986-26-27
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Pierre-Paul Prud'hon, French
Black and white chalks on blue wove paper
Sheet: 11 x 8 5/8 inches (27.9 x 21.9 cm)
The Henry P. McIlhenny Collection in memory of Frances P. McIlhenny, 1986
1986-26-27
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In the Loge, c. 1879
Mary Stevenson Cassatt, American
Pastel with gold metallic paint on canvas
Sheet: 25 9/16 × 31 3/4 inches (64.9 × 80.6 cm)
Gift of Mrs. Sargent McKean, 1950
1950-52-1
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Mary Stevenson Cassatt, American
Pastel with gold metallic paint on canvas
Sheet: 25 9/16 × 31 3/4 inches (64.9 × 80.6 cm)
Gift of Mrs. Sargent McKean, 1950
1950-52-1
[ More Details ]