古钱币鉴定知识（Ancient coin identification knowledge）.docVIP

古钱币鉴定知识（Ancient coin identification knowledge） The identification of ancient coins up, is a delicate subject, it requires us to pay attention to the daily accumulation of knowledge, observation and thinking, careful comparison. Combined with the literature and history of previous research results, find out some useful theoretical basis to follow, and to summarize the general rules in the identification of ancient coins. This paper introduces several methods of identification of ancient coins. 1, copper Chinas ancient coins, mostly in form of copper alloy casting, and alloy different coins also shows different colors. The copper coin is different, because the ancient smelting technology in different regions, casting coins are different, each dynasty has different features. In general, Cu Zn alloy for casting coins is yellow, copper tin alloy casting coin blue. In Qing Dynasty, the Republic of China, Xinjiang, Tibet and other places cast money, a zinc lead with copper, cast after the money is red. Most of the Han Dynasty to the Tang and Song Dynasties, the coins were cast in bronze, which is characterized in reddish greenish white copper strip. Ming Jiajing period, began to transition to the apocalypse, brass, brass casting, a custom color, coins than ever changed. For example, the Qin Dynasty city is the main cast cast alloy of copper and tin, copper was green red, texture is stiff; the Sui Dynasty five baht money because tin component, copper white, known as white money; five years of Qianlong, cast money Jiaxi. Called green money. Obviously, China has to follow the law of ancient coins casting. 2, the concept of rust See this coin, there are two kinds: one is to explore a product, is handed down. Excavations buried in the ground for many years, the surface was covered with a patina. Handed down due to oxidation in air, the surface has a layer of patina. Black or brown. Copper is a relatively stable metal, not easy to rust under normal temperature. After several dec