1, muscle removal: all the meat on the bone is removed. If it's the head and spine, scald it with boiling water first, and then remove the muscles. Rinse with clean water. On bones, small broken muscles that are not easy to eliminate can be brushed with a brush until they are clean. Dry naturally.

2. Degreasing: Soak the bone in 0.5% ~ 0.8% sodium hydroxide solution 1 ~ 3 days to remove some muscles that are difficult to remove and remove grease from the bone. In the process of soaking, check frequently to prevent the bones from falling apart. Then take it out and rinse it with clean water.

3. Bleaching: Bleaching with 0.5% ~ 1% hydrogen peroxide for 30min, or soaking with 1% ~ 3% bleaching powder aqueous solution for 1 ~ 3 days. The soaking time should be mastered flexibly, mainly depending on whether the bone has turned white, and it should be taken out immediately after turning white, otherwise the surface of the bone will be corroded and become rough, losing the luster of the bone. The fished bones were washed with clear water and dried.

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