Prison Interior [SEP] material used
Prison Interior
Prison Interior (Spanish: Interior de cárcel) is an oil on canvas painting completed by the Spanish artist Francisco Goya (1746–1828) between 1793-94. The painting is bathed in a dim, cold light which gives it look feeling of purgatory. 
It is one of a number of works the artist made of scenes set in lunatic asylums, including "Yard with Lunatics" (1793–1794) and "The Madhouse" (1812-1813). These works were painted at a time when mad-
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