“Stone.” Always best Cornwall stone.
“Paris white.” Superior quality of whiting.
“Parts.” Always so many parts by weight, unless otherwise stated.
“D. L. Zinc.” Particular brand not essential. Any good quality oxide of zinc will do.
Ruby and Maroon.—Preparation of silver:
| Nitric acid | 1 ounce |
| Water | 1 ounce |
Dissolve the silver till saturated, then put a plate of copper in the solution to precipitate the silver in a metallic state. Wash well with water to remove the acetate of copper.
Flux for Above.—Six dwts. white lead to 1 ounce prepared silver.
Tin Solution.—Put the acid (aqua regia) in a bottle, add tin in small quantities until it becomes a dark-red color; let it stand about 4 days before use. When the acid becomes saturated it will turn red at the bottom of the bottle, then shake it up and add more tin; let it stand and it will become clear.
Aqua Regia.—