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CFC-12 (dichlorodifluoromethane) has about the same boiling point as ammonia. However, CFC-12 is not toxic to humans, so it is safe to use in your kitchen. Many large industrial refrigerators still use ammonia. In the 1970s, it was discovered that the CFCs then in use are harmful to the ozone layer, so as of the 1990s, all new refrigerators and air conditioners use refrigerants that are less harmful to the ozone layer Before anything goes in the freezer, make sure it is wrapped and/or packaged appropriately. This will vary according to the item you are freezing. Meats should be wrapped in plastic and foil, or in an appropriately sized freezer bag with excess air removed. Plastic storage containers should be appropriately sized for the cont