As with all glass products, you must exercise an appropriate degree of care, especially when cooking food at high temperatures. There are three primary risks associated with using glassware for cooking: (1) breakage due to a sudden temperature change applied to the glassware; (2) breakage due to impact if the glassware is dropped or knocked against a hard object; and (3) burning when handling hot bake ware. Failure to follow the warnings below may result in personal injury or property damage, or may cause your glassware to break or shatter immediately or later. Avoid sudden temperature changes to glassware. Do not: add liquid to hot glassware; place hot glassware on a wet or cool surface, directly on countertop or metal surface, or in sink; or handle hot glassware with wet cloth. Allow hot glassware to cool on a cooling rack, potholder or dry cloth. Be sure to allow hot glassware to cool as provided above before washing, refrigerating or freezing. Oven must be preheated before inserting glassware. Do not use on or under a flame or other direct heat sour eluding on a stovetop, under a broiler, on a grill or in a toaster oven. Add a small amount of liquid sufficient to cover the bottom of the dish prior to cooking foods that may release liquid. Avoid handling hot glassware (including ware with silicone gripping surfaces) without dry potholders. Avoid microwave misuse. Do not use glassware to microwave popcorn or foods wrapped in heat-concentrating material (such as special browning wrappers), heat empty or nearly empty glassware in microwave or overheat oil or butter in microwave (use minimum amount of cooking time). Be careful when handling broken glass because pieces may be extremely sharp and difficult to locate. Handling your glassware without an appropriate degree of care could result in breakage, chipping, cracking or severe scratching. Do not use or repair any glassware that is chipped, cracked or severely scratched. Do not drop or hit glassware against a hard object or strike utensils against it.