Whaam! [SEP] material used
, he constructed his paintings in a traditional manner, starting with a sketch which he adjusted to improve the composition and then projected on to a canvas to make the finished painting. In the case of "Whaam!", the sketch is on two pieces of paper, and the finished work is painted with Magna acrylic and oil paint on canvas. Although the transformation from a single-panel conception into a diptych painting occurred during the initial sketch, the final work varies from the sketch in several ways. The sketch suggests
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