GOLD-COLORED COIN MATERIAL

摘要

The inflationary tenedencies which have prevailed throughout the world for years and the considerable increase of transactions effected with the aid of machines for vending merchandise and services, have resulted in a need for coins having a high value. Public authorities who are responsible for the coinage often consider the use of smaller coins for this purpose. These coins should differ in color from the most valuable existing coins. Particularly gold colors are suitable for this purpose. For this reason there is a demand for a gold-colored material which can well be processed to make coins by casting, rolling and stamping and has a high resistance to tarnishing so that it retains as long as possible the original gold color. Thus in accordance with the invention coins or the like can be made from a copper-base alloy which contains 1 to 7 % tin and 1 to 7 % aluminum and contains aluminum and tin in a total not in excess of 10 %, balance copper and inevitable impurities which are due to the manufacture.