Secrets of Glass Manufactory - Compositions to Imitate Precious Stones, called French Paste

Secrets Concerning Colors and Painting
§ I.  Paint In Varnish On Wood
§ 2. Paint On Paper
§ 3. Compositions For Limners
§ 4. Make Transparent Color
§ 5. Compositions to Dye Leather
§ 6. Color or Varnish Copperplate Prints
§ 7. For Painting on Glass
§ 8. Color Preparation for Oil, Water, and Crayon
       Marble and Jasper Paper
       Methods to Clean Paintings
       Making Good Crayons
       Directions for Coloring Prints
       Directions for Painting in Oil
§ 9.  Preparation of Lapis Lazuli to Make Ultramarine

XCV.  A valuable secret to make exceeding good crayons, as hard as red chalk, discovered by Prince Rupert, brother to Prince Palatin.

    Grind on the stone some tobacco-pipe clay, with common water, so as to make a paste of it.  Then take separately each color, and grind them, when dry, on the stone, so fine as to sift them through a silk sieve.  Mix, of each of the colors , with your first white paste, as much as will make it of a higher or paler hue, and embody the whole with a little common honey and gum-arabic water.

    Note.  You must be attentive to make crayons of various degrees of hues in each color, for the chiaros and oscuros, or lights and shades.  Then roll each crayon between two boards very clean, and set them to dry on paper for two days in the shade.  To complete their drying, lay them in the sun; and then you may use them with satisfaction.

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