Canning novelty. Early methods of manufacture employed poisonous lead solder for sealing the cans. Studies in the 1980s attributed the lead from the cans as a factor in the disastrous outcome of the 1845 Franklin expedition to chart and navigate the Northwest Passage. Later studies found this to be false. Increasing mechanization of the canning process, coupled with a huge increase in urban populations across Europe, resulted in a rising demand for canned food. A number of inventions and improvements followed, and by the 1860s smaller machine-made steel cans were possible, and the time to cook food in sealed cans had
Campbell's Soup Cans synonymous with the "Campbell's Soup Can" paintings. Warhol subsequently produced a wide variety of art works depicting Campbell's Soup cans during three distinct phases of his career, and he produced other works using a variety of images from the world of commerce and mass media. Today, the Campbell's Soup cans theme is generally used in reference to the original set of paintings as well as the later Warhol drawings and paintings depicting Campbell's Soup cans. Because of the eventual popularity of the entire series of similarly themed works, Warhol's reputation grew to the point where he was not only the