The luster of Cu-Zn alloy is even better than some natural gold, which can be confused with truth visually. Identification is also very simple. One bite will tell the truth. If there are teeth marks, it is real gold, otherwise it is fake gold. This involves the principle of crystal chemistry: gold is pure, the atoms in the crystal.

There are dozens of components in Cu-Zn memory alloy. Usually, the main components of Cu-Zn memory alloy that we can use are: Cu 64%, Zn 18%, Ni 18% or Cu-Zn-Al memory alloy. Martensite transformation temperature is about 65438 000℃.

The history of gold development in China:

The results of archaeological excavations show that human beings have discovered and used gold for 7000 years. China has been mining and using gold for at least 4000 years. People have known about gold since the Neolithic Age.

According to the age of tombs or sites excavated by archaeologists, the earliest is the early Shang Dynasty. For example, the eared gold ornaments unearthed in the tombs of early Shang Dynasty in Zhengzhou, Henan Province, the gold nuggets, gold foils and gold leaves unearthed in the tombs of Yin Ruins in Huixian, Henan Province, and the Yin Ruins in Xiaotun, Anyang, Henan Province, all prove that China began to use gold as early as 3,500 years ago and mastered the processing and production technology of gold.

China's gold production has left its own deep mark in the history of world gold development, which constitutes an important chapter in the history of world gold. Judging from the history of gold mining in the world, most countries started with gold panning.