Plastic self sealing bags are often seen in our daily life. They can be used to hold food, clothing, electronic products and other items. But as we all know, plastic bags are divided into toxic and non-toxic. How should we distinguish them?

的塑料袋，它们是用聚乙烯，聚丙烯和密胺等原料制成的，可以用来装食品；有毒的塑料袋，它们是由氯乙烯做成的，这只能作一般包装使用，如用其包装食物就有中毒的危险。

Non toxic plastic bags, which are made of polyethylene, polypropylene and melamine, can be used to hold food; toxic plastic bags, which are made of vinyl chloride, can only be used for general packaging. If they are used to package food, there is a risk of poisoning.

把塑料袋放在水里，并用手将其按到水底，稍等片刻，浮出水面的即为塑料袋，沉在水底的即为有毒塑料袋。

Put the plastic bag in the water and press it to the bottom of the water by hand. Wait for a moment. The non-toxic plastic bag will appear on the water surface, and the toxic plastic bag will sink under the water.

用手抚摸塑料袋表面，很光滑是的。如果颜色混朦，触之发粘、发涩，就是有毒的。

Touch the surface of the plastic bag with your hand. It is smooth and nontoxic. If the color is misty, sticky and astringent, it is toxic.

用手使劲抖动塑料袋时，声音哗哗啦啦很清脆的是塑料袋，而声音发闷或没有什么声音的，便是有毒的塑料袋。

When shaking the plastic bag with your hands, the sound is loud and clear. The non-toxic plastic bag is very clear, and the toxic plastic bag is the one with stuffy sound or no sound.

燃烧：将塑料袋剪下一角，放在火上一烧，的烧之即燃，将它离开火后仍继续燃烧，并出现黄色火焰，而且熔塑像蜡烛一样一滴一滴往下掉，发出石蜡气味；有毒的，不易燃烧，燃烧后呈绿色火苗，并有一股呛鼻的异味。

Burning: cut off a corner of the plastic bag and burn it on the fire. The non-toxic one will burn immediately. After leaving the fire, it will continue to burn, and yellow flame will appear. Moreover, the melting statue will drop down drop by drop like a candle, giving off the smell of paraffin; toxic, not easy to burn, it will appear green flame after burning, and have a choking smell.

闻气味：有刺激性和使人恶心等不正常气味的，多为有毒的，或可能是增塑剂或其他添加剂过量，质量均较差。

Smell: irritating and disgusting abnormal smell, mostly toxic, or excessive plasticizer or other additives, with poor quality.