A dime is the legal unit of RMB. The fifth set of RMB was changed from aluminum alloy to stainless steel, steel white, and the outer ring was nonagon. It was released in 2000 by 199 1.

On the front, there are "People's Bank of China", "1 corner" and Chinese pinyin "corner" and year number, while on the back, there are chrysanthemum patterns and China People's Bank Chinese pinyin "China People's Yin Hang" with a diameter of 19mm. 18 in may, the fourth set of RMB chrysanthemum 1 cent coins stopped circulating in the market. Exchange stopped on April 30th, 20 19.

Extended data

Special materials wear easily.

The dime and commemorative coins issued in China are mostly made of aluminum-magnesium alloy, aluminum-magnesium alloy, aluminum-nickel alloy, copper-nickel alloy, copper-zinc alloy, nickel-plated steel core and copper-plated steel core. Coins made of these materials are hard, wear-resistant, scratch-resistant and easy to store, so after circulating in the market for decades, there are still a lot of old coins to play with.

The corner of chrysanthemum 1 is made of aluminum and zinc, which is light in weight, soft in texture, very wear-resistant, easy to scratch and scratch, easy to oxidize and difficult to preserve. This kind of coinage material is easy to roll and form, and achieves the high relief effect of chrysanthemum 1 corner. On the other hand, however, coins made of this material also have some disadvantages. First, in the process of coinage, there are many defective products in the corners of chrysanthemum 1 because the material is soft, easy to prick, out of shape and difficult to polish.

The chrysanthemum 1 corner accounts for a considerable proportion of the so-called wrong coins in online high-priced auctions. Second, chrysanthemum corner 1 is not resistant to friction in circulation, which is easy to cause scratches and wear. After years of friction in people's pockets and business seas, most of them will be "completely crushed" and the wear will be more serious. Third, coins have deep grooves, which are easy to shelter evil people from evil practices and contribute to oxidation. Compared with coins made of other materials, the loss rate of chrysanthemum 1 horn in market circulation is quite high.

"Inside the Outer Circle" nonagon

199 1 The coins issued in the same period are 1 yuan (peony flower), 5 cents (plum blossom) and 1 corner (chrysanthemum). 1 yuan is a nickel-plated coin with steel core, 5-cent coin is a copper-zinc alloy (sent to 200 1), and 1 cent coin is an aluminum-zinc alloy, all of which are external circles and internal circles, except that 1 cent coin is a nonagon with an external circle and a concave inside, which belongs to special-shaped coins. This design makes the pattern chrysanthemum on the back more stereoscopic, which is more obvious than 1 50 yuan.

The reason for this arrangement is that chrysanthemums have high level requirements when they bloom, otherwise it is difficult to receive a good three-dimensional effect. The advantages of using concave nonagon are as follows: firstly, the concave part can well represent the level of chrysanthemum petals, and the aesthetic degree of chrysanthemum 1 corner relief art is incomparable with any other coins and circulating commemorative coins.

It is no exaggeration to say that every chrysanthemum with a corner of/kloc-0 is a beautiful relief work of the national emblem; Second, the upper spire of nonagon is in the middle of the benchmark, and the lower horizontal line is just arranged as the year position. As far as its 22.5 mm diameter area is concerned, it is beneficial to casting and the composition is beautiful and generous.

Coin size goes against common sense.

Coins issued in New China are relatively consistent in size and face value every year. In other words, 1 cent is less than 2 cents, 5 cents must be greater than 2 cents, and so on. However, in the chrysanthemum 1 dime set, chrysanthemum 1 dime (22.5 mm in diameter) is bigger and thicker than pentagon (20.5 mm in diameter), which is quite "contrary to common sense".

This situation was changed in 2000 when the orchid 1 horn (diameter 19 mm) was released. Chrysanthemum corner 1 Why is it bigger than corner 5? That's to ensure the effect of chrysanthemum relief and make it more stretched and pleasing to the eye. If the coin is too small, its effect will be greatly reduced; If coins are too small, too thick and too deep, it will greatly increase the difficulty of minting coins. This phenomenon of high relief of the groove has created a special case in the history of China coinage.