Liquid nitrogen evaporates, and can cause violent oxidation of organic material. Ingestion of liquid nitrogen can cause severe internal damage, due to freezing of the tissues which come in contact with it and to the volume of gaseous nitrogen evolved as the liquid is warmed by body heat. In 1997, a physics student demonstrating the Leidenfrost effect by holding liquid nitrogen in his mouth accidentally swallowed the substance, resulting in near-fatal injuries. This was apparently the first case in medical literature of liquid nitrogen ingestion. In 2012, a young woman in England had her stomach removed after ingesting a cocktail made with
Peters Ice Cream over by Adelaide Steamship Company (AdSteam) in the late 1980s, and then by Pacific Dunlop (now known as Ansell) upon AdSteam's collapse. Pacific Dunlop sold its food assets in the mid-1990s, and the ice-cream division was acquired by Nestlé, which continued to market brands including Choc-Wedge, Drumstick, and Monaco Bar. Ownership of a separate Peters Ice Cream business in Western Australia passed as part of Peters and Brownes (PB) Foods to Fonterra in 2006 and to Nestlé in 2009, giving Nestlé nationwide control of the brand. Formerly, Peters in Western Australia exported ice-creams to Japan where it was called Lady