As can be seen in the background of the archive photo illustrating the threshing process, olive trees thrive in the area of Karanis. Although olive oil is very perishable, its production leaves many traces. These two photos suggest that olive oil production was carried out on a large scale at Karanis. The residue from olive pressing could be used for animal feed or fuel. For many years, this olive residue was thought to be bread, until scientific analysis determined its true nature.