Observe the label on the package and observe the seal of the package.

1. Observe the label on the package: the genuine Jiu San soybean oil will have the word Jiu San on the label, and the writing is clear, and the label is clean and tidy. The writing on the label is fuzzy and unclear, or the label is stained. It is counterfeit or spoiled Jiusan soybean oil.

2. Observe the seal of the package: The seal of the authentic Jiu San Soybean Oil will have clear trademarks and anti-counterfeiting marks, while the seal of the counterfeit or spoiled Jiu San Soybean Oil will be uneven or damaged.