Crayons or Drawing Chalks.

Scientific American 19, 11.5.1861

The civilizing influence of art is constantly improving the taste of the people. Color, pattern and design must now pervade all our manufactures to keep pace with the improved judgment of purchasers as to true beauty. Nothing tends to advance art more than making draqing one of the common branches of education, and few materials will render draqing more popular than the colored chalks or crayons as made by Messrs. Joel, of Paris, which are prepared thus. Take three-quarters of a pound of blue clay, three-quarters of a pound of the coloring required, such as vermilion, chrome, Prussian blue, orpiment, &c., two ounces of turpentine, four ounces of spirits of wine, and six ounces of the shellac. The clay must be well mixed with water, passed through a fine lawn sieve, and allowed to subside; the water is then poured off and the clay dried. The shellac must be dissolved in the mixed turpentine and spirit with a little warmth. The dried clay and the coloring must be now well blended in a mortar, and the nthe shellac mixture added and well incorporated till the whole is a doughy mass; it is then to be rolled out into a pencil form and dried with stove heat. To make the crayons of uniform substance, the paste may be placed into a cylinder, with a hole at one end and a piston at the other (like a boy's pop-gun), the "wormy" pieces that pass through are then cut into proper lengths and dried.

- Septimus Piesze.

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