1. Year of the Ox Commemorative Coin 202 1 The People's Bank of China issued China Year of the Ox Gold and Silver Commemorative Coin 202 1 on June 55438+00, 2020. Commemorative coins *** 15, including 9 gold commemorative coins and 6 silver commemorative coins, all of which are legal tender in People's Republic of China (PRC). Gold and silver commemorative coins are round, rectangular, fan-shaped and plum blossom-shaped, with abstract or realistic cow-shaped patterns on the back.
Second, the application of lottery gold With the development and progress of the times, many new technologies have also been applied in the coinage industry, and the casting technology of metal commemorative coins is also improving day by day, and its technological level is also constantly improving. In the 202 1 Year of the Ox commemorative coins issued, some currencies adopted the gold-shaking technique, such as1commemorative coins from 0 yuan and 50 yuan.
Color gold process is made by mixing and smelting 75% gold with copper, aluminum, silver, cobalt, palladium, iron, cadmium, nickel and other metals. When it melts, it will form colored gold, such as black and blue. The darker the color, the more expensive it is.
Moreover, compared with traditional gold and platinum, colored gold has higher hardness than pure gold, and colored gold can better reflect the exquisiteness and delicacy of metal materials.
Third, the application of new technology In the 202 1 Year of the Ox commemorative coin issued this time, casting techniques such as sand blasting and high relief are also widely used. This new technology is to spray the pattern part on the extremely fine frosted surface, and when making gold and silver coins, the pattern part presents a beautiful silver layer; Or make the pattern higher than the surface of the coin, increase its three-dimensional sense and layering, and make the whole object look lifelike.