Witches' Flight [SEP] material used
Witches' Flight
Witches' Flight (; also known as Witches in Flight or Witches in the Air), is an oil on canvas painting completed in 1798 by the Spanish painter Francisco Goya. It was part of a series of six paintings related to witchcraft acquired by the Duke and Duchess of Osuna in 1798. 
It has been described as "the most beautiful and powerful of Goya's Osuna witch paintings."
The painting was sold to the Duke and Duchess of Osuna on 27 June 1798, to decorate their
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