This body is commonly called paper-clay or cellulosic clay. This composite material is a mixture of casting clay and cellulose fibers from paper. I have prepared my own clay. This way i could build a very thin porcelain body from Month Blanc clay and the height would not deform the body during the firing. Porcelain kept its memory, I have got this translucent body out of my kiln.

Naked Porcelain
Mont Blanc clay
Hand shaped
Cone 10