Turkey has milleniums of experience with terra cotta. This piece uses an engobe covering on both the outside and inside. And the Turks have developed the technology to process the clays enough that they can be fired to almost porcelain strength (although this piece is low fired and porous). This piece was given to me by a resident artist in the studio at the Kale Seramik factory in Çan, Turkey (around 2002). At the time it was the biggest ceramic factory complex in the world, making everything from fine china to bricks. Many potters do not really understand what terra cotta is.
The term Terra Cotta can refer to a process or a kind of clay. Terra cotta clays are high in iron and available almost everywhere. While they vitrify at low temperatures, they are typically fired much lower than that and covered with colorful glazes.