Identification of genuine Ejiao: The key points of identification of genuine Ejiao are: after being melted, genuine Ejiao is fragrant, with sesame oil flavor, thick but not sticky, and slightly salty. Within 1 years, it is green and firm; To more than 5 or 6 years, the color turns yellow and crisp, which is better. The surface of real donkey hide glue is brownish black, smooth, transparent in light, brownish red, hard and fragile, brownish brown in cross section, glassy in luster, slightly fragrant in gas and slightly sweet in taste. While the fake Niu Pijiao and miscellaneous leather rubber are sticky, hard and not easy to break, with black or gray-black cross section and slightly fishy smell.

one identification method is: take 2g pieces, put them in a pot and heat them. When heated, the genuine pieces will burst, then swell and melt, emitting white smoke and having a strong fragrance of sesame oil. The counterfeit product has a strong muddy smell, soybean oil smell or fishy smell after burning. Some people also identify it this way: Take 5 grams of water and add 3 ml, heat it to 9℃, and the genuine product will be completely dissolved in about 6 minutes, showing light red turbidity, with white material precipitation and oil dripping out of the liquid surface, and will not agglutinate after standing for 4 hours. The counterfeit product dissolves in about 1-16 minutes, showing dark brown-red or gray brown-red, with no precipitate, no oil drops or only a small amount of oil drops on the liquid surface, and agglutinates or thickens after standing for 4 hours.