Solder for 22 carat gold:

1

dwt.

0

grs.

of 22 carat gold.

2

grs.

silver.

1

gr.

copper.

1

dwt.

8

grs.

Solder for 18 carat gold:

1

dwt

0

grs.

. of 18 carat gold.

2

grs.

silver.

1

gr.

copper.

1

dwt.

3

grs,

Solder for 60s. gold:

1

dwt.

0

grs.

of 60*. gold.

10

grs.

silver.

8

grs.

copper.

1

dwt.

18

grs.

Solder for 40s. gold: but middling silver solder is more generally used.

1

dwt.

fine gold.

1

dwt.

silver.

2

dwt.

copper.

4

dwt.

Dr. Hermstadt's imitation of gold, which is stated not only to resemble gold in colour, but also in specific gravity and ductility, consists of 16 parts of platinum, 7 parts of copper, and 1 of zinc, put in a crucible, covered with charcoal powder, and melted into a mass. - Hanoverian Magazine.

Gold alloyed with platinum is also rather elastic, but the platinum whitens the alloy more rapidly than silver.

• By others, 4 grain* of bras are added to the solder; it then fuses beautifully and is of good colour. Zinc is sometimes added to other gold solders to increase their fusibility, the zinc, (or brass when used,) should be added at the last moment, to lessen the volatilization of the zinc.