 It was left immersed in water the day before its use, to make it easy to work, while the "terra de pistai" was beaten with a wooden sledgehammer to obtain a very fine powder, after which it was sieved by removing impurities and larger granules.Once the "terra de orbetzu" was softened and the powder obtained from the "terra de pistai", they were mixed.For this purpose, balls were prepared from the first one, placed on the floor to be crushed with the feet, at this point the "terra de pistai" was gradually added, thus obtaining a homogeneous mixture.