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
Lew Hing stories of the building with the basement as storage. Lew Hing and other Family Association members lived on the third floor. In the 1880s–1890s, canning food was still a new concept. Lew Hing had embarked on a long period of trial and error before the cannery could reliably produce safe and edible canned foods. When food was not preserved properly or the cans were not fully sterilized (for example, each can had to be soldered individually by hand), noxious bacterial action would ruin the product, causing cans to swell and even explode. Eventually, Lew Hing developed safer and more effective