How to distinguish the quality advantages and disadvantages

How can a plastic meal box be fake or true?
The inferior disposable plastic meal box can be bought for a few cents, so it is popular with some small restaurants.For example, in the production of inferior meal boxes, a large number of industrial calcium carbonate, talc powder, paraffin and other toxic and harmful materials are generally added, which pose a direct threat to the health of users.
Fake plastic meal box is soft, gently cracked, leakage, poor strength and deep color; no factory name, no trademark and no production date, easy to sink in water (qualified product proportion is less than 1, less than 1, not sinking); the price is cheap, generally below 0.10 yuan, and the real box price is above 0.13 yuan.