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... grass juice 3, red salt 1, water 6 The ratio is made into a tanning liquid, a stock solution is soaked with seven times the water to soak the animal skin, and the raw liquid is gradually increased every day. At the same time, the animal skin is repeatedly turned over and the skin is finally better than the previous one. .
This discovery also opened up the strict thinking. After studying the kind of grass juice, he began to try to use various herbs to make the raw liquid to carry out vario ...
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