Part 196

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.—

Nitric acid 2 parts Muriatic acid 1 part

Dissolve grain gold in the aqua regia so as to make a saturated solution. Take a basin and fill it 3 parts full of water; drop the solution of gold into it till it becomes an amber color. Into this solution of gold gradually drop the solution of tin, until the precipitate is complete. Wash the precipitate until the water becomes tasteless, then dry slowly and flux as follows:

Flux No. I.—

Borax 3 parts Red lead 3 parts Flint 2 parts

Run down.

Rose Mixture.—

Purple of Cassius 1 ounce Flux No. 1 6 ounces Prepared silver 3 dwts. Flint glass 2 ounces

Grind.

Purple Mixture.—

Purple of Cassius 1 ounce Flux No. 8 (see page 307) 2 1⁠/⁠2 ounces Flint glass 2 ounces

Grind.

Ruby.—

Purple mixture 2 1⁠/⁠2 parts Rose mixture 1 1⁠/⁠2 parts

Grind.

Maroon.—

Rose mixture 1 part Purple mixture 2 parts

Grind. {307}

Black—Extra quality.—

Red oxide of iron 12 parts Carbonate of cobalt 12 parts Oxide of cobalt 1 part Black flux A (see next formula) 80 parts

Glost fire.

Black Flux A.—

Red lead 3 parts Calcined borax 1⁠/⁠2 part Lynn sand 1 part

Run down.

Black No. 2.—

Oxide of copper 1 part Carbonate of cobalt 1⁠/⁠2 part Flux No. 8 (see next column) 4 parts