Health; Look at the color, pure oil is colorless, oil will have color because the pigment in oil is dissolved in oil during production; Look at the sediment, which is mainly composed of
Points are impurities.
The second taste. Each oil has its own unique smell. You can put a drop or two of oil on your palm, rub your hands together and smell it carefully while it is hot. have
Strange oil indicates that there is a problem with the quality, and the smelly oil is probably waste oil; You can't buy it if it smells of mineral oil.
Three flavors. Take a drop of oil with chopsticks and taste it carefully. Oils with sour taste are unqualified products, and oils with bitter taste have been rancid, and some are.
The oil with peculiar smell may be "gutter oil".
Listen 4: Take one or two drops of oil from the bottom of the reservoir, spread it on flammable paper, ignite it and listen to its sound. Products with normal combustion and no noise are qualified products; burn
If the combustion is abnormal and makes a squeaking sound, the water content exceeds the standard and it is an unqualified product; The explosion of "beep" when burning indicates that the water content of oil is strict.
If the product exceeds the standard and may be adulterated, don't buy it.
Five questions: ask the merchants about the purchase channels, ask for the purchase invoices or check the sampling inspection report of the local food hygiene supervision department if necessary.