It is a heavy weight kind of air dry clay. It comes
from real earth clay.

The finished products can be
left dried and harden themselves.

This kind of clay needs to be kept in an airtight storage to prevent it  from dry out.
We can get a porcelain masterpiece out of Pottera
Natural clay by putting it in the kiln at 1,000-1,200 °C.
Once it becomes hard before project finished,we
can add a little amount of water to moisture the dry part and resume to work.
Its shelf life is about 1.5 years.