首先要看塑料袋的外觀是否有“食品用”的標志。通常這個標志應該在包裝袋正面，比較醒目的位置。

Firstly, it is necessary to check whether the appearance of the plastic bag has a "food use" logo. Usually, this logo should be prominently placed on the front of the packaging bag.

其次是看顏色，一般而言，有顏色的塑料袋大都使用了廢舊塑料的回收料，是不能用來裝食品的。比如，一些菜市場用來裝魚、蝦等水產品或肉類的劣質黑色塑料袋，或者是原本是用來裝垃圾的塑料袋，消費者都應避免使用。

Secondly, it depends on the color. Generally speaking, plastic bags with colors mostly use recycled materials from waste plastics and cannot be used to hold food. For example, some markets use inferior black plastic bags to hold fish, shrimp, and other aquatic products or meat, or plastic bags that were originally used to hold garbage, consumers should avoid using them.

要看塑料袋有無雜質。將塑料袋放在陽光或燈光下，看是否有黑點，有沒有口子。有雜質的塑料袋，肯定是使用了廢塑料做原料。

Check if there are any impurities in the plastic bag. Place the plastic bag in sunlight or light to see if there are any black spots or gaps. Plastic bags with impurities must have used waste plastic as raw material.

聞一聞塑料袋有沒有味道，是否讓人覺得惡心。合格的塑料袋應該是沒有味道的，而不合格的塑料袋由于使用了添加劑，會帶有各種味道。

Smell if the plastic bag has any odor and if it makes people feel nauseous. Qualified plastic bags should have no odor, while unqualified plastic bags may have various odors due to the use of additives.

合格的塑料袋具有相應強度，不會一撕就破；而不合格的塑料袋由于添加了雜質，往往強度很差，容易破裂。

Qualified plastic bags have corresponding strength and will not tear easily; However, unqualified plastic bags often have poor strength and are prone to breakage due to the addition of impurities.

合格的塑料袋在抖動時，會發出清脆的聲響；不合格的塑料袋往往是“嗡嗡”的悶響。

Qualified plastic bags will make a crisp sound when shaken; Unqualified plastic bags often have a buzzing sound.

把塑料袋放在水里，并用手將其按到水底，稍等片刻，浮出水面的即為不合格塑料袋，沉在水底的即為有毒塑料袋。

Put the plastic bag in the water and press it down to the bottom with your hand. Wait for a moment. The plastic bag that rises to the surface is considered unqualified, while the one that sinks to the bottom is considered toxic.

用手撫摸塑料袋表面，表面應該是光滑的。如果顏色混朦，觸之發粘、發澀，就是有毒的。

Touch the surface of the plastic bag with your hand, and the surface should be smooth. If the color is blurry, sticky and astringent when touched, it is toxic.

燃燒：將塑料袋剪下一角，放在火上一燒，合格的燒之即燃，將它離開火后仍繼續燃燒，并出現黃色火焰，而且熔塑像蠟燭一樣一滴一滴往下掉，發出石蠟氣味；有毒的，不易燃燒，燃燒后呈綠色火苗，并有一股嗆鼻的異味。

Burning: Cut off a corner of the plastic bag and place it on the fire. Once it is qualified, it will ignite. After leaving the fire, it will continue to burn and a yellow flame will appear. The molten plastic will drop down like a candle, emitting a smell of paraffin; Toxic, not easily flammable, it turns into a green flame after combustion, and has a pungent odor.

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