Casein, a modified natural plastic, is derived from what source?

Casein is a protein that is found in milk, primarily derived from cow's milk. This natural plastic has been modified for various uses, particularly in the production of adhesives, paints, and coatings due to its favorable properties such as sheen, durability, and flexibility.

Its origin from milk makes it distinct compared to other materials, which may be derived from plant fibers, fish oil, or wood bark. The unique chemical structure of casein contributes to its ability to be molded and shaped when processed properly, setting it apart from synthetic plastics derived from petroleum or other sources. Thus, identifying its source as cow's milk accurately reflects the biological and chemical basis for its production and application in engineering and materials science.