How did prehistoric primitive people make leather?

Leather refers to animal skin that has been tanned, nitrated or otherwise treated to prevent corruption, but when it is dry, it is relatively soft and elastic. At present, the earliest record of it is in Tian Zhang Guan Pi, "Palm gathers leather in autumn, gathers leather in winter, and presents leather in spring, so leather is given to Bai Gong according to the formula."

According to the consulting data, primitive humans only made animal clothes at first, and did not make them by tanning or salting, so strictly speaking, their clothes can only be "leather clothes", not "leather clothes". So the landlord's question is not very strict.

Want to know how to make leather, as follows: Tanning is the main method to modify protein in animal skin to make leather tough and not perishable. There are many tanning methods for fur, including chrome tanning, aluminum tanning, chrome-aluminum tanning, alum tanning, formaldehyde tanning and so on. Their technological processes are basically the same, generally divided into preparation process, tanning process and finishing process.

Prehistoric primitive human and animal clothing practices: hunting, peeling, sewing (the picture below shows the bone needle made by Neanderthals).

After all, at that time, the production level was low, so it was good to make animal clothes. Don't make leather clothes for others ~