Col porcelain is a cheap, non-toxic, easy-to-work-with material. Despite its name it is not porcelain. It does not require heating since it gets hard by exposition to fresh air. Originally from Argentina, its main components are cornstarch and white glue, having also low quantities of oils and glycerol which give its porcelain-like texture. Because most of the constituents are biodegradable, lemon juice and sodium benzoate are some times used to prevent the growth of bacteria and funghi. It can be made at home very easily and it's used for small projects. However, it is dissolved by heat or water, so it's not suitable for making cups and similar stuff with it.