The old Dutch tiles used to be traditionally baked in ovens. With a mold or by hand clay was formed into screed in the typical size of 22 cm x 22 cm. The terracotta tiles were baked at a high temperature in coal-fired ring ovens. By using different types of clay, the beautiful red-orange color shading was created which is typical of terracotta and the old antique Dutch tiles. They are therefore often called antique terracotta tiles.