The sesame oil essence and salad oil are simply blended according to the ratio of 1: 1, so the "sesame oil" produced in this way is less than 3 yuan per catty, while the price of real sesame oil per catty is at least higher than that in 12 yuan. How to distinguish the authenticity of sesame oil? The simplest way is to freeze sesame oil to minus 1 degrees in the refrigerator. Pure sesame oil is liquid, and fake sesame oil will condense, and ordinary small ground sesame oil will smell slightly burnt. At the same time, try to buy products of well-known brands in big humidity. Tips for buying sesame oil: at first glance, pure sesame oil is light red or red with yellow, if mixed with other oils, the color will be different. For mixed rapeseed oil, it will be dark yellow, and cottonseed oil will be black red. Water test method can be adopted: dip a drop of fragrant oil drops into the calm water surface with chopsticks, and pure sesame oil will show a colorless and transparent thin oil flower, while adulterated sesame oil will show a thicker and smaller oil flower. Second, look at transparency: generally good quality sesame oil has good transparency and no turbidity. Third, look at whether there is sediment: good quality sesame oil has no sediment and suspended matter, and its viscosity is low. Fourth, look at whether there is stratification: if there is stratification, it is likely to be adulterated mixed oil.