One is to identify from the outer packaging. The outer packaging bag of real salt is thick and soft to the touch, while the outer packaging bag of fake salt is crisp and thin. There are obvious creases on both sides of the fake salt packaging bag, but there are no creases on the real salt packaging bag. Look at the back of the packaging bag, the number of each package of real salt is different, and the number is the same, so the whole batch of salt is fake salt; The anti-counterfeiting mark of each package of real salt is fixed in the same position \ x0d \ x0d \ Second, look at the sealing of the packaging bag. The mouth of the packaging bag of real salt is sealed neatly and it is difficult to tear. The seal of fake salt is sealed with an electric soldering iron, which is easy to deform and tear. The true salt is filled into the cylindrical plastic film on the assembly line, and then cut and packaged, and the upper and lower sealing parts will not appear serrated; Fake salt's packaging bag is a one-time molding packaging bag, and the sealing part is serrated. \ x0d \ x0d \ Third, look at the salinity. True salt is relatively clean, with high whiteness and no impurities. However, the whiteness of fake salt is poor, and there are impurities. In terms of weight, fake salt is generally not up to the standard. \x0d\\x0d\ Four chemical methods. The ingredients in real salt contain iodine besides NaCl, and there is no iodine in fake salt. It can be distinguished by the principle that starch solution turns blue when it meets iodine. In addition, the difference between industrial salt and edible salt is that it contains impurities such as magnesium chloride, which easily absorbs moisture in the air and becomes damp. It can be distinguished by observing whether it becomes damp for a long time, or by adding clarified lime.