When it comes to gutter oil, almost everyone is in danger, but what is gutter oil made of? The gutter oil may be refined and processed from greasy floating objects in swill and sewers; It may also be processed and refined from inferior pork, pigskin and boiled internal organs; It may also be the product of repeatedly used oil and adding a little new oil.

2 Is it reliable to detect cooking oil by garlic?

Some people say that cooking oil can be detected by burning a garlic head. Just pour the oil into the pot, heat it and put a peeled garlic head in it. Once the garlic turns red, it means that it contains aflatoxin, so it is determined that the oil is cooking oil. On the contrary, garlic head is not red, which means it is healthy and safe oil. Although this method is simple and clear, there is no scientific evidence to prove that this method is scientific and feasible. 3 how to distinguish gutter oil

First of all, we can distinguish gutter oil by looking at it, because normal cooking oil is transparent in color, while gutter oil is repeatedly used and specially processed, so it contains various chemical elements, and the color is turbid, and sediment is easy to appear at the bottom of the bottle. Smell

Secondly, we can smell it. Normal edible oil is made from various crops, so it has a fragrant smell, while gutter oil can smell sour and peculiar smell because of its chemical composition, which makes people uncomfortable. Taste

You can also prepare a chopstick, dip a drop of oil in the palm of your hand, combine your hands, gently rub it and lick it with your tongue. If it has a faint aroma, it is normal cooking oil, and once it feels sour and bitter, it means gutter oil. Burning

Finally, the method of burning is to pour the oil into the pot and turn on a big fire. After burning for a while, if it turns black and muddy, it is waste oil.