 It was obtained from sandy soils, it was yellowish in colour, it was not malleable, but it was used to make the dough refractory, thus giving the pots and pans an excellent resistance to fire, making them suitable for daily use.This land was taken along the banks of frummi bellu (or even Riu bellu), in an area called "arrùbiu margins" (margin, red shore).Once collected it had to be filtered to remove impurities.