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 Rock & Roll shows and fan magazines. Whereas previous artists used repetition to demonstrate their skill at depicting variation, Warhol coupled "repetition" with "monotony" as he professed his love of artwork themes. Warhol followed the success of his original series with several related works incorporating the same theme of Campbell's Soup cans subjects. These subsequent works along with the original are collectively referred to as the Campbell's Soup cans series and often simply as the Campbell's Soup cans. The subsequent Campbell's Soup can works were very diverse. The heights ranged from to . Generally, the cans were portrayed as if