What is the texture of Qin Bing's armor? Copper or leather?

There are three kinds of armor materials for Qin soldiers: leather armor, stone armor and metal armor (bronze armor and iron armor). References:

Qin Jun, the bamboo slips of Qin Tomb in Sleeping Tiger Land, is equipped with solid and precise metal armor. Before the Spring and Autumn Period, the main protective equipment of soldiers was leather armor. Although there was armored armor in the Warring States period, leather armor is still an important equipment. In Zi Yibing by Xun, there is a saying that "the Chu people have faded, and the rhinoceros skin thinks it is armour", which shows that the Lang Guojun team is still dominated by leather armour at the end of the Warring States Period.

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I hope it can help you find the root of the problem.

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