7Q5 [SEP] material used
7Q5
Among the Dead Sea scrolls, 7Q5 is the designation for a small Greek papyrus fragment discovered in Qumran Cave 7 and dated before anyone claimed to be able to identify it by its style of script as likely having been written sometime between 50 B.C.E. and 50 C.E. The significance of this fragment is derived from an argument made by Spanish papyrologist Jose O'Callaghan in his work "¿Papiros neotestamentarios en la cueva 7 de Qumrân?" ("New Testament Papyri in Cave 7 at Qumran?") in 1972, later reasserted
to cathodically protect metals that are exposed to sea water. A zinc disc attached to a ship's iron rudder will slowly corrode while the rudder stays intact. Similarly, a zinc plug attached to a propeller or the metal protective guard for the keel of the ship provides temporary protection.
With a standard electrode potential (SEP) of −0.76 volts, zinc is used as an anode material for batteries. (More reactive lithium (SEP −3.04 V) is used for anodes in lithium batteries ). Powdered zinc is used in