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Do not have "oil label"
Observe whether the packaging is complete, whether there is any leakage, whether the lid, bottle cover is rusted or scratched, and whether the label is oil-immersed.
Do not buy cans "bulging"
Observe the bottom, lid or cap. It is better to have a lid and cap slightly concave. If you find the lid of the can protrude outward, do not buy it.
The sound is crisp and bright
The product is good if the soud is crisp when the lid is snapped by hand, if the sound is degraded, the product is bad
Labels to be completed
Observe the production date and shelf life of the product. Be careful when purchasing products with incomplete labels or products near the shelf life.