Term (also vine water, vine blood) for the water-like wound sap that emerges in spring as a reaction to pruning. This is a protective mechanism in plants, because the sap contains highly effective disinfectants that prevent the penetration of bacteria and close the cut wounds with a resin plug. However, wounds inflicted on the plant during pruning, which is usually carried out during hibernation, do not start to "bleed" until the beginning of vegetation when budding starts. The supposed medicinal effect of vine tears was already known in ancient Rome. The scholar Pliny the Elder (23-79) reported on the juice, then called "Aqua vitis" or "Lachryma vitis", as a remedy for many skin diseases such as psoriasis and rashes, and mixed with olive oil as a depilatory.