Darryl - from Cotati, CA
Start by reading your recipe. If a recipe calls for baking "pan", the recipe was developed using metal, and it's assumed a shiny metal. If you are baking in shiny aluminum, follow the recipe instructions. When using a dark metal pan, reduce the oven temperature by 25 degrees. Likewise, if you use a glass baking dish, you would reduce the oven temperature by 25 degrees.