Why do you think the sand is used?

Green sand is a mixture of sand with bentonite clay, pulverized coal, and water used in metal casting. It is not necessarily green in color, but is called green because it is used while wet, like the "green wood" sometimes used by wood turners.

Shubham Kanungo

Asst Professor

Department of Mechanical Engineering

Shri Vaishnav Institute of Technology and Science,Indore