Food plastic packaging bags are often used in people's lives, but you must be careful when using them. Some plastic packaging bags are poisonous and cannot be used to directly hold food. Below we will teach you several ways to identify it! 1. Eye observation method Non-toxic plastic bags are white, transparent or slightly transparent, and have uniform texture; toxic plastic bags are colored or white, but with poor transparency and turbidity. The plastic surface stretches unevenly and contains small particles. 2. Listen with ears When ears shake the plastic bag with your hands, the clear sound indicates that it is a non-toxic plastic bag; while the sound is small and dull is the toxic plastic bag. 3. Touch with your hand Touch the surface of the plastic packaging bag with your hand. It is smooth and non-toxic; sticky, astringent, and waxy are toxic. Fourth, use the nose to smell the non-toxic plastic packaging bag is tasteless; the smelly or abnormal smell is toxic. 5. Submergence test method. Put the plastic bag in the water, press it to the bottom of the water by hand, wait a while, the non-toxic plastic packaging bag that rises to the surface, and the toxic plastic packaging that sinks to the bottom of the water bag. 6. Combustion method. The non-toxic plastic bag is flammable, the flame tip is yellow, and the part is cyan. When burning, it drips like candle tears and has a paraffin smell; the toxic plastic bag is not easy to burn, and it will go out immediately after leaving the fire. It is yellow, the bottom is green, softened and can be drawn.