1, look at the color. Pure sesame oil is light red or red with yellow, if mixed with cooked rapeseed oil, then dark yellow or blue color, mixed with cottonseed oil will be black red.
2, smell. The fragrance of pure sesame oil is rich and mellow, such as adulteration, mixed with peanut oil or soybean oil, etc. The fragrance is pungent, with peanut or beany smell or burnt taste.
3, shake. The bottled oil is shaken gently, if the bubbles produced are transparent and disappear quickly, they are pure; if the bubbles are opaque and yellow, and disappear slowly, they are inferior.
4. Water test. When a drop of sesame oil is dropped into a bowl of clear water, the pure sesame oil will show a large, thin and transparent oil spray, which will quickly spread and condense into a number of small oil droplets. Adulterated oil flowers are small and thick and are not easy to spread.