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White Metals Based On Platinum.—

I.—Platinum, 1 part; copper, 4 parts; or platinum, 1 ¹/₂ parts; copper, 3 ¹/₂ parts.

II.—Platinum, 10 parts; tin, 90 parts; or platinum, 8 parts; tin, 92 parts.

III.—Platinum, 7 parts; copper, 13 parts; tin, 80 parts.

IV.—Platinum, 2 parts; steel, 98 parts.

V.—Platinum, 2.5 parts; steel, 97.5 parts.

IV and V are for gun metal.