 Many Iznik tiles survive on buildings of known date and although the designs generally differs from those used on pottery, it is often possible to determine an approximate date of a vessel by comparing the composition and motifs with those on tiles.Towards the end of the 16th century there was a marked decline in the quality of the pottery produced in İznik.This has been linked to the loss of patronage by the Ottoman court and with the imposition of fixed prices in a period of inflation.