Oh my god! Plastic food bags and poisonous.

Plastic food packaging is often used in people's life, but also must be careful when use, some plastic bags are poisonous and can not be used for direct food. Then you will discern plastic food bags exactly have poison? Small make up teach you today a few action: first, by eye observation: non-toxic plastic food packaging is white, transparent or slightly transparent, uniform texture; Toxic plastic bags for the color or is white, but the transparency is poor, the turbidity, tensile plastic surface uneven, with small particles. Second, listening with ears: use a hand shaking plastic food packaging bags, issued a ringing sound that is non-toxic; The sound small, stuffy is poisonous. Three, with the hand touch: by hand touch surface of plastic food packaging bags, very smooth and is non-toxic; Sticky, hair acerbity, waxy feeling is toxic. Four, nose to smell: non-toxic plastic food packaging is tasteless; Have to stimulate abnormal smell or taste is toxic. Five, the heavy water test method: put the plastic food packaging in the water, with the hand to press it to the bottom, just a moment, surface is non-toxic, sink in the bottom is poisonous. Six, burning method: non-toxic plastic food bags flammable, yellow flame tip, local in cyan, burning like a candle tears dripping, the smell of paraffin; Toxic plastic food bags won't burn, away from the fire that is quenched, flame cutting edge or yellow, black, green at the bottom, can soften the wiredrawing, also can smell a pungent smell. More than six tips is the simplest and most practical method, everyone learned?
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