Our top-rated Naturals Bakeware collection is made of pure aluminum for superior heat conductivity and produces consistent evenly browned baked goods every time. Use and care: before initial use and after subsequent uses hand wash with warm soapy water. Dishwasher use is not advised as discoloration will occur due to the cleaning agents used in automatic dishwasher detergent. This discoloration is merely cosmetic and will not affect baking properties or safety of the pan. Natural aluminum pans work well with parchment paper silicone baking mats and also traditional butter or shortening and flour methods. When roasting savory foods such as vegetables butter or cooking oil work well. Nylon wood or silicone utensils are recommended. Metal utensils and scouring pads may scratch natural aluminum pans but will not affect baking performance. Aluminum is reactive to acidic ingredients such as vinegar and tomato products. These foods may darken pit or corrode the pan after prolonged use.