1. When the herring stone is soaked, it can be soaked in mineral oil such as baby oil, glycerin and olive oil to prevent edible oil from breeding bacteria on the surface of the herring stone. When soaking oil, it is not recommended to remove oil in the morning, so as not to affect the evaporation of water from herring stone.

2. Fresh fish stones will contain a lot of water, so they need to be kept in a cool, windless, dark and dry environment for more than half a month. After natural drying in the shade, the subsequent polishing step is carried out.

3. After the fish stone is dried in the shade, the aged part of the chewing surface of the fish stone should be cleaned first, which will not affect the appearance of the final product, and can also reduce the fishy smell emitted during grinding.

4. Fish stones that have been preliminarily polished need to be fixed with glue. The cementing here is to prevent cracking and slag collapse when grinding by grinder or engraving machine. This step can be omitted if hand grinding is used.

5. During rough grinding, first remove impurities and cracks on the surface with sandpaper with low mesh, and polish the shape of herring stone regularly. In the grinding process, a small amount of water can be used for lubrication. After finishing and grinding, it can be soaked in oil after grinding.

6. Herring stone is mainly composed of keratin, and its texture is warm and moist. Pay attention to the change of dry and wet when wearing, to prevent wind, sun and rain, air conditioning and heating from blowing directly, and to avoid surface cracking.