Dry ice is frozen carbon dioxide. It will keep perishable foods colder and longer than traditional ice. It is an excellent refrigerant for shipping, camping and bulk use. Unlike traditional ice that melts into water, dry ice turns into a gas appearing like fog or steam. As a result, dry ice is used for special effects in movies, television, concerts and other special events.
Ice should be clear in color as well as odorless and tasteless. When purchasing ice, look for bags that are properly closed and secure (no drawstring ties). The bag should carry the manufacturer's name and address. Also look for the International Packaged Ice Associaton (IPIA) symbol.