About Pastels . .  
Pastel is NOT colored chalk, which is a limestone substance. Pastel is pure pigment - the same pigment used in making all fine art paints. It is the most permanent of all media when applied to a permanent ground and properly framed. There is no oil to cause darkening or cracking, nor other substance or medium to cause fading or blistering. Pastels from the 16th Century exist today, as fresh and alive as the day they were painted!

The following is a statement from the Pastel Society of America in New York:
Pastel does not at all refer to pale colors, as the word is commonly used in cosmetic and fashion terminology. The name Pastel comes from the French word “pastische” because the pure powdered pigment is ground into a paste, with small amount of gum binder, and then rolled into sticks. The infinite variety of colors in the Pastel palette range from soft and subtle to bold and brilliant.
An artwork is created by stroking the sticks of dry pigment across an abrasive ground, embedding the color in the “tooth” of the paper, sanded board or canvas. If the ground is completely covered with pastel, the work is considered a Pastel painting; leaving much of the ground exposed produces a Pastel sketch. Techniques vary with individual artists.Pastel can be blended or used with visible strokes. The medium is favored by many artists because it allows a spontaneous approach. There is no drying time, and no allowances to be made for a change in color due to drying. 

Historically, Pastel can be traced back to the 16th century. Its invention is attributed to the German painter Johann Thiele. A Venetian woman artist, Rosalba Carriera was the first to make consistent use of Pastel! Chardin did portraits with open stroke, while Later preferred the blended finish. Thereafter a galaxy of famous artists . . . Watteau, Cooley, Delacroix, Millet, Manet, Renoir, Toulouse-Lautrec, Vuillard, Bonnard, Glackens, Whistler, Hassam, William Merritt Chase . . . just to list the more familiar names, used Pastel as finished work rather than preliminary sketches.

Edgar Degas was the most prolific user of Pastel, and its champion. His protégé, Mary Cassatt, introduced the impressionists and Pastel to her friends in Philadelphia and Washington, and thus to the United States. In the spring of 1983, Sotheby Parke Bernet sold at auction two Degas Pastels for more than $3,000,000 each! Both Pastels were painted about 1880.

Today, Pastel paintings have the stature of oil and watercolor as a major fine art medium. Many of our most renowned living artists have distinguished themselves in Pastel, and enriched the art world with this beautiful medium.
As with any fine work of art or fine furniture, it is advised not to place a Pastel painting in direct sunlight. When under glass, the sun’s heat can create humidity, which could cause moisture damage to develop. Whenever transported or not in a hanging position a Pastel painting should always be face up.