The easiest way to detect gutter oil is to put a peeled garlic in cooking. Garlic is the most sensitive to aflatoxin. If garlic turns red, it is gutter oil, which contains a lot of aflatoxin, and edible garlic is white. Refrigerate the oil in the refrigerator for 2 hours. If there is white foam, it is gutter oil. Please send out your love and forward this information to your relatives or the people of the whole country, so that those criminals can't make waste oil! !