1, first of all to see if the bottom of the bottle is smooth. Place the vase on a plane and gently touch it to see if the vase will sway.
2, check whether the bottle body color is even. In particular, color vases should be noted.
3. If the mouth part of the vase is cut, it is necessary to see if the mouth is stubble. The mouth of the vase is open to see if the mouth is uneven.