Leatherworking or skin tanning is a chemical physics process that, due to the physical effects and the effects of chemicals or vegetable matter, can be converted into unbreakable, valuable and usable leather for human being.

Before tanning, you have to make preparations for the removal of excess residues on the skin (such as excess fat, wool, etc.), which includes several steps as follows.
Dry and salt
Hold the skin after separating the body with drying or salting for tanning. This is done by using salt, brine or salt in a salt solution. Drying is also done in the sun or by hot air flow.

Remove additions
(As you can see in the picture), an extra piece of skin, such as the ears, tail, poison, and extra flesh, which remains on the skin and does not matter in terms of leather, should be removed from the skin before each operation.