8 Kashan Star and Cross Tiles - Persia 12th-13th century

This collection comprises five cobalt blue and three turquoise glazed monochrome tiles.
Dimensions: 11cm (max length) approximately each.
These items are accompanied by its Thermoluminescence test that confirms its age (QED2124/BI-0503). The three types of tiles (Star tile, Cross tile 1 and Cross tile 2) have been tested.
Kashan was a Persian city known for producing high-quality pottery during the medieval period. The town was well-located, near sources of minerals needed to create their distinctive light-colored stone pastes.
Copper oxide is one of the cheapest raw materials used to color glazes and also one of the most widespread. When copper oxide is used in a lead glaze, it turns a lush, grass-green color, while it becomes more turquoise in an alkaline glaze.
Alkaline glazes, perhaps best known for producing the classic Egyptian turquoise color, date back thousands of years and were found in Persia, China, and Mesopotamia. The alkaline glazes’ strengths are their ability to produce brilliant, clear colors at earthenware temperatures without the assistance of lead.
One cobalt cross tile restored.