Properties And Uses

Metallic silver has a sp. gr.of 10.424 to 10.57, a pure white colour, and a fusing temperature of about 1904° F. (1040° C); it is extremely malleable and tough, and the best conductor of heat and electricity; it offers great resistance to oxidation, and is not affected by fused caustic alkali. Its chief applications are for coinage purposes, when it is always alloyed with more or less copper; and for ornamental objects, whether in the solid form or as a thin coating on some cheaper base. The surfaces of standard silver articles are sometimes given a " frosted " appearance by heating till a thin skin has had its copper oxidized, then removing this oxide by immersion in ammonia or dilute sulphuric acid, thus leaving only pure silver showing.