In a brewery, new wine is poured into new wineskins. After the wine has fermented for some time in the old wineskins, the old wineskins become dry, hard, and brittle. During this fermentation of wine inside the wineskin for some time, the wineskin is stretched to its limits and becomes brittle. The wineskins might burst if they were used once more. To be made as new, the used wineskins must go through a renewal procedure. The wineskin needs to be submerged in water for a period of time. Then, it has oil poured onto it and the oil is massaged into the leather to renew it and make it used again.