Do you know milk is used in plastic ?
Milk is one of nature's natural foods. We drink it and make butter, cheese and yoghurt from it. The chemist, however, makes plastics from it. The substance in milk that forms the plastic is called Casein. Casein plastic is not as widely used today as in the past but, buckles, buttons, knitting, needles and umbrella handles are some of the common objects still made from it.
May be surprising but true.