Take of gold, 4 parts; silver, 3 parts; copper 1 part; and zinc, 1 part.
148. GOLD SOLDER No. 2
Take of gold, 3 parts; silver, 3 parts; copper, 1 part; zinc, 1/2 part.
149. GOLD SOLDER No. 3
Take of gold, 2 parts; silver, 3 parts; copper, 1 part; and zinc 1/2 a part.
The gold, silver, and copper must be fused in a crucible before the zinc is added, or else you cannot keep them in the vessel while heating. When all are completely fused, they must be well stirred, and run into bars. Solder No. 1 is for gold 16 carats and upwards; No. 2 is for that 14 carats fine; and No. 3 for lower qualities. If more zinc is added, it will fuse at a lower heat, but the colour is not so good.
150. MOCK GOLD
Fuse together 16 parts of copper, 7 of platinum, and 1 of zinc. When steel is alloyed with 1/500 part of platinum, or with 1/500 part of silver, it is rendered much harder, more malleable, and better adapted for all kinds of cutting instruments. Note.—In making alloys, care must be taken to have the more infusible metals melted first, and afterwards add the others.
151. BRITANNIA METAL
Take 4 parts of brass, and 4 parts of tin; when fused add 4 parts of metallic bismuth, and 4 parts of metallic antimony. This composition is added at discretion to metallic tin, according to the quality you wish to make.