Aluminum foil we deal in is impermeable to light, bacteria and moisture. It has advanced ability to block out the bacteria as well as moisture. This foil allows for good food storage and is also suited to cover baking surfaces as well as wrapping of foods. It does not let the moisture and warmth of cooking to lose easily. This is needed to wrap and protect several types of delicate foods, such as vegetables and others. Aluminum foil has an impenetrable oxide layer and is corrosion resistant. This is very soft, yet is quite tough.