1, first of all to see if the bottom of the bottle is stable. Place the vase on a flat surface and gently touch with your hand to see if the vase shakes.
2, check the bottle color is uniform. In particular, color vases should pay attention to this point.
3, is to see whether there is a large black-like objects on the surface of the vase. This is caused by the fact that the raw material for the vase is not completely opened. If the size of the cluster is small enough, there is no serious problem, but if it is larger than 5mm, you need to contact the seller. Replace the product.
4. Check whether there are a lot of bubbles on the surface of the vase (except for the intentionally made bubble vase). If there are a lot of bubbles and they are all together, they are not; the diameter of the bubbles is too large to be. (The number of bubbles and the size of the diameter should be relative to the size of the vase)
5, If the mouth of the vase is cut, it is necessary to see if the mouth is collapsed. If the mouth of the vase is open, it is necessary to see if the mouth is uneven.