Sangkhalok refers to earthenware
made in both Si Satchanalai and Sukhothai
during the Sukhothai Period. The pottery
was glazed in colours such as pale blue
and brown, with a transparent coating
over decorative designs. Sangkhalok was exported far and wide to places such as
Ayutthaya, the south of present-day Thailand, the Philippines, Indonesia and Japan.
A group of Sangkhalok kilns was found in north of the city wall,
especially around the ramparts of Wat Phra Phai Luang. There are two types of
Sangkhalok kilns: around updraft kiln with holes at the bottom for ventilating heat
vertically, and a crossdraft kiln, in a tortoise-shell shape with an outlet for ventilating heat horizontally.
Most of the Sangkhalok kilns in
Sukhothai were made of brick, although some
kilns in Si Satchanalai were slab kilns dug into
the ground. From an excavation by the Fine
Arts Department, the brick kilns were found
in hard soil, the lowermost layer of earth in Sukhothai.