It’s difficult to believe that something like milk could turn into a material that’s as moldable as clay, and as strong as concrete when dried. Tessa Silva-Dawson, a student at the Royal College of Art, developed a way to turn waste milk into a compostable clay-like material by combining it with chalk. Titled Chalk Cheese, the material uses excess skimmed milk created in the production of butter or cream. Rather than throwing this milk away, she mixed it with chalk sourced fr