Leather tanning is more complicated, such as chrome tanning. Simple indigenous processing with dog skin as an example;

1. Remove meat, oil, feces, sludge, blood, etc. Start with the skin, spread it flat on the board, and polish it with coarse iron sand or bricks until the root of coarse hair is slightly visible.

2. Then use 500g of alum and 5000ml of water, boil it, put it in a pot, let it cool, completely immerse the skin in it, take it out after about 24 hours, put it on a board, tighten it with the hair down, and fix it with nails.

3. Apply 50-degree saltwater (saltpeter 250g, water 250ml, boiling 150ml) to the leather board repeatedly and evenly. A little dry, the dog skin will blister. If there is no blister in some places, apply it again until it bubbles.

4. Blow the dog skin cool, and after it is completely dry, carefully smooth it with a fine emery cloth.

5. Tanned dog skin should be grasped into a ball by hand, and it should be able to slowly and naturally open after loosening, indicating that tanned fur is soft and elastic.

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