Cod's soft liver can be tinned (canned) and eaten. Tinned fish and meat were sold in rectangular cans. The Germans supplemented their meat rations with tinned food. Iron is more prone to rusting than (tinned) copper. Tinned corned beef is also used in mainland Europe. The tinned tuna had come from Thailand. Fifty years later, the company diversified into soups, meatballs and tinned fruit. In 1869 new rations of tinned mutton were introduced for British seamen. A clean unoxidised tip is tinned by applying a little solder and flux. Finally they are rinsed and stored in water until ready to be tinned. The outer casings of lamps have been made of brass or tinned steel. The use of tinned rations simplified the provision of supplies. The U.S. Army Quartermaster Corps provided field rations, tinned food and survival equipment. This legend was based on an earlier belief that tinned pears were often disguised chayotes. Usually this is of the cheapest variety, and served with tinned condensed milk.