Sand-based biodegradable articles, such as planar frangible targets and formed three-dimensional tableware and food containers, are disclosed. The articles are made formed of a mixture of sand and a decomposable binder, the binder preferably comprising by weight 30-40% starch, 20-30% salt, 1-3% oil and...http://www.google.de/patents/US5569514?utm_source=gb-gplus-sharePatent US5569514 - Method of forming a sand base article using a decomposable binder and the article formed thereby
