Vegetable oils that people often eat mainly include sesame oil, soybean oil, rapeseed oil, peanut oil and cottonseed oil. , its quality appraisal is as follows:

1, see transparency. Distinguish between the refining degree of oil and the removal degree of phospholipid. High transparency, less moisture and impurities, good quality. Good vegetable oil, after standing for 24 hours, should be clear and transparent, without turbidity, precipitation and suspended matter.

2. Look at the color. Sesame oil and soybean oil with good quality are dark yellow, generally light yellow, rapeseed oil is slightly green or golden yellow, peanut oil is light yellow or light orange, and cottonseed oil (sanitary oil) is light yellow.

3. smell the smell. Touch a little oil with your fingers, rub it in your palm, and smell it after rubbing. Good quality oil should have its own oil flavor according to different varieties, and it can't have other peculiar smell or even sour taste.

4. Try it. Stick a little oil on chopsticks and put it in your mouth to distinguish its taste. It should have the unique taste of this product, and there should be no peculiar smell such as bitterness, astringency, burnt taste and sour taste.

True sesame oil is not afraid of freezing. If it is adulterated sesame oil, put it in the refrigerator for a while, and the oil surface 100% is frozen. Dip chopsticks in a drop of fragrant oil and drop it into calm water. When a good sesame oil meets water, it will disperse immediately, and a colorless, transparent and thin sesame oil flower will appear, which is really beautiful, proving that sesame oil is pure. When adulterated sesame oil drops into water, it will generally roll into a ball, or a thicker and smaller oil flower will appear.

Sesame oil is peeled and fried with pure sesame seeds, then pressed by machine, and small sesame oil is pressed by hand with a stone mill.

Authentic sesame oil is not allowed to add any other oils, pigments and spices. The color should be light red or red with yellow, and the aroma is pure and rich.

The adulterated sesame oil is dark yellow or dark red, and its fragrance smells either too light or too heavy, because it contains spices. In addition, good quality sesame oil has good transparency, will not be turbid, has no sediment and suspended matter, and will not be layered.