The solders to be used for gold, silver, copper and brass are given in the preceding part. You commence operations by reducing your solder to small particles and mixing it with powdered sal-ammoniac and powdered boras in equal parts, moistened to make it hold together. Having fitted of the joint to be soldered, you secure the article upon a piece of soft oft charcoal, lay your soldering mixture immediately over the joint, and then with your blow pipe turn the flames of your lamp upon it until fusion takes place. The job is then done and ready to be cooled and dressed up.

Iron is usually soldered with copper or brass, in accordance with the above process. The best solder for steel is pure gold or pure silver, though gold or silver solders are often used successfully.

Platina can only be soldered well with gold; and the expense of it, therefore, contributes to the hindrance of a general use of platina vessels, even for chemical purposes, where they are of so much importance.