The following methods are generally used to distinguish the authenticity of old vinegar trademarks:

1. Look at the trademark. For vinegar, the vinegar produced by regular manufacturers will have its own acid content. If you look at Shanxi's mature vinegar, you will find the trademark and logo of this vinegar.

2. Look at the date. The production date of vinegar must also appear on the vinegar packaging. Everyone must know that under normal circumstances, the validity period of vinegar must be displayed.