We can look at the bar codes of several bottles on it. As long as it is genuine, no two bar codes are exactly the same. Only those fake factories will print a bar code and stick it on different bottles in order to save costs. Third, we need to look at the fineness of the paper label on the outside of the bottle. If it is genuine, it is attached by machine, and the paper label has a high degree of fit with the bottle body and the position is correct. If it is fake wine, it may be stuck by hand, or there is a bubble in the middle, which is not firm, or the position is a little crooked.