Opaque simply means you can't see through it. Depending on the blend of plastic it may or not be opaque.
opaque plastic cups are made out of plastic, which is molded whilst still hot into a cup shape.. Plastic cups can be made up of a number of materials, polypropylene, polyethylene, polycarbonate....
Because light destroys the riboflavin.
Light destroys the riboflavin in milk.
Because they are reliable,light and easy to carry.
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