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
Dog food is misleading as it can include dead or dying animals or carcasses rejected from the human food chain and is not the same as USDA inspected, approved, or certified, which are FDA approved for human consumption. Dry dog food (kibbles) is most often packed in multi-wall paper bags, sometimes with a plastic film layer; similar bag styles with film laminates or coextrusions are also used. Wet dog food is often packed in aluminum cans or steel cans. Packaging regulations for dog food are often very similar to corresponding regulations for human foods. Raw feeding is the practice of feeding domestic