Henley's Twentieth Century Formulas, Recipes and Processes

by Unknown

Very Hard Silver Solder for Fine Silverware.—

I.—	Copper	1 part
	Silver	4 parts
	Hard silver solder.
II.—	Copper	1 part
	Silver	20 parts
	Brass	9 parts
III.—	Copper	2 parts
	Silver	28 parts
	Brass	10 parts
	Soft silver solder.
IV.—	Silver	2 parts
	Brass	1 part
V.—	Silver	3 parts
	Copper	2 parts
	Zinc	1 part
VI.—	Silver	10 parts
	Brass	10 parts
	Tin	1 part

These solders are preferably to be employed for the completion of work begun with hard silver solders, defective parts alone being treated. For this purpose it is sometimes advisable to use copper-silver alloys mixed with zinc, as for example:

VII.—	Silver	12 parts
	Copper	4 parts
	Zinc	1 part
VIII.—	Silver	5 parts
	Brass	6 parts
	Zinc	2 parts

This last formula (VIII) is most commonly used for ordinary silverware.

Silver Solders for Soldering Iron, Steel, Cast Iron, and Copper.—

I.—	Silver	10 parts
	Brass	10 parts
II.—	Silver	0 parts
	Copper	30 parts
	Zinc	10 parts
III.—	Silver	30 parts
	Copper	10 parts
	Tin	0.5 parts
IV.—	Silver	60 parts
	Brass	60 parts
	Zinc	5 parts

{664}

In those solders in which brass is used care should be taken that none of the metals employed contains iron. Even an inappreciable amount of iron deleteriously affects the solder.

V.—Copper, 30 parts; zinc, 12.85 parts; silver, 57.15 parts.