A Negress [SEP] material used
A Negress
A Negress () is an 1884 realistic portrait study oil painting on canvas by the Polish artist Anna Bilińska-Bohdanowicz. During World War II, the painting was stolen; it was recovered in 2012.
Description.
The picture was painted in oil technique in 1884 in Paris. It is a portrait of a black woman located on a light background. She is shown from waist up, dressed in a white robe, but is part naked, exposing a breast. She wears a gold necklace,
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