こちらのアルミホイルってどちら側に食べ物を載せますか？
以前、トースト系のパンを買ったら、濁った面を外にして渡されました。

日本だとキラキラした面が外にきますよね？

素朴な疑問です。

Which side of Aluminum Foil should I use, the shiny or the dull side?


A: Actually, it makes no difference which side of the aluminum foil you use―both sides do the same fine job of cooking, freezing and storing food. The difference in appearance between dull and shiny is due to the foil manufacturing process. In the final rolling step, two layers of foil are passed through the rolling mill at the same time. The side coming in contact with the mill's highly polished steel rollers becomes shiny. The other side, not coming in contact with the heavy rollers, comes out with a dull or matte finish.

The exception is when using Reynolds Wrap® Release® Non-Stick Aluminum Foil. The non-stick coating is applied during manufacturing to the dull side of the foil. Always place the non-stick (dull) side toward the food.

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General Info
Aluminum Foil is the most versatile of all food wrapping materials. It can withstand both heat and cold. Reynolds Wrap® Aluminum Foil was first introduced in 1947. Since that time it has become one of the most immediately identifiable brands on the market. Reynolds Wrap is 98.5% aluminum. The balance is primarily iron and silicon. These are added to give the strength and puncture resistance obtained only in the alloy used in Reynolds household foil. Reynolds Wrap® Aluminum Foill contains no recycled material and complies with U.S. Food and Drug Administration requirements for direct contact with food.