Clay and its characteristics have been known to human kind for a long time and the first records of its use date back to antiquity. The grey clay of Komenda is well known for its absorption and for the process of its extraction, which is of key importance.

This clay is sourced from the deep layers of soil through supervised manual labor and by using appropriate tools. After it had been dug up, the clay must be left to dry in the sun for at least two days in order to soak up the energy of the sun and become even more active.