Page:Cyclopedia of Painting-Armstrong, George D (1908).djvu/242

234 thread-like veins. Next, with thin white in a camel's hair pencil, pass partly over the same veins with short thick touches, which may be continued in the narrower parts with a fine striping pencil. When the work has become quite hard it should be smoothed with very fine glass paper before being varnished.

Jasper Marble. The ground is composed of Venetian red, red lead and a small quantity of chrome yellow, mixed with oil and turpentine in equal parts. Or additional brilliancy may be given to the color by vermilion or lake instead of Venetian red. While the ground is wet, dab on spots of white, using either a piece of sponge or a tool, and soften with a badger, subsequently repeating the white touches in parts to give them increased brilliancy. Spots of blue, brown or yellow may be added in the same manner. When nearly dry, veins and threads may be put in with a camel's hair pencil.

Granite. Granite is a well-known igneous rock, composed principally of three minerals, Quartz, Felspar and Mica, united in a confused crystallization, that is, without any regular arrangement of the crystals. The following is the order in which the ingredients are proportioned: Felspar, Quartz, Mica. The name of the stone is derived from its granular formation.

There are very many kinds of granite used in the arts. Amongst these are the gray, red, green, violet, rose-colored, etc.

For the gray granite the ground is a gray, mixed of black and white, and, over this, spots are to be splashed with black and white, used separately, the work being carried on as described in relation to Porphyry. For the various shades of red granite the ground is composed of Venetian red and white, the spots being black, white and vermilion. In the same way any of the other kinds may be represented.