 From the second half of the 19th century until the 1930s European collectors were confused by the different styles of Iznik pottery and assumed that they originated from different pottery producing centres.Although it is now believed that all the pottery was produced in Iznik (or Kütahya, see below) the earlier names associated with the different styles are still often used.In the 19th century until the 1860s all Islamic pottery was normally known as 'Persian' ware.