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1, look at the skin color
The leather color of the aging material is golden yellow or dark yellow brown. If it is pale yellow, then it should not be in the collection, and there is no collection value.
2, see the annual ring
Looking at the annual rings is to look at the intensity. The higher the density, the better. The good material is that the distribution of the annual rings can be clearly seen.
3, see the shape
The well-preserved yabai handpieces should be based on the shape, which can give people a sense of conformity, and the shape is regular.
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