"Looking" consists of three aspects. First, look at the product label, the manufacturer's address, contact information, and whether the relevant certification has been obtained. The second is to see if there are any impurities. Look at the light. If there are uneven gray-black dust particles, don't buy them. The third is to look at the color, it is recommended to use colorless plastic products. Because coloring is bound to add some additives, the safety of the product will be reduced. For example, putting oil, vinegar, beverages, etc. in a colored plastic bottle will dissolve a part of the color masterbatch, which is harmful to your health.

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