What do you pay attention to when processing dog skin?

First, remove the meat and greasy matter from the dog skin, grind it flat on the board with a coarse sand cloth or brick until the root is slightly hairy, add 2500 ml of water with 250g of tea oil bran, boil it into a basin, cool it, put it into the dog skin and soak for 12 hours, wash it repeatedly with soap to remove the stench.

Second, add 2500 milliliters of water with 500g of alum, boil and pour into the basin. After cooling, soak the dog skin completely, take it out about 24 hours later, open and tighten the hair on the board, and fix it on the edge with iron nails.

Third, after the dog skin is fixed, boil the remaining 150ml with 250g nitrate and 2500 milliliters of water. Apply the nitrate water repeatedly and evenly on the skin. After a little dry, the dog skin will blister. If there is no blistering in individual places, you can apply it again until blistering. Fourth, after the dog skin is dry, grind it carefully and gently with a fine sand cloth, and then grasp the dog skin into a ball with your hands, if you can open it slowly.