Since its conception in 1907, aluminum foil has become a kitchen staple thanks to its versatility. It's typically used in the cooking or food storage processes before being met with the trash. However, the trash can doesn't need to happen so soon. Aluminum foil is a product that is safe to use multiple times so you can get more out of it, create less waste, and probably save a little money while doing so.

Aluminum foil is safe to use again even after going through the cooking process and acquiring some spots of discoloration. The color changes on the aluminum are normal, and occur due to the aluminum's reaction to oxygen. The oxygen and aluminum combine to form a layer of aluminum oxide on the surface of the foil, this helps to keep the foil food-safe. Factors like sunlight, moisture, and high temperatures like that of an oven can all contribute to the harmless discoloration of aluminum foil.

If you so desire, you can wash the aluminum foil to remove some or all dark spots. It may be helpful to remember though, that it doesn't matter which side of the foil touches food. Feel free to flip your foil and use the other side in a pinch.