A viscous syrup an olive based tanning agent for leather it is even edible. perfume olive leaves are in such plentiful supply we could currently use them in 40 percent of global leather production more than 700000000 square meters that would be 100 percent of automobile leather 100 percent of upholstered furniture and 100 percent of clothing we could switch over completely to all of tanning and even if there weren't enough leaves we could always use the olive palace or the black water like the waste water from all of the oil mills didn't start to cry for. olive leather as it's known it went gr...