用Aluminum foil(錫紙)的那一面來包裹食物, 要視乎你烤焗甚麼食物, 需要較大熱度和不易燒焦的食物, 錫紙光面要向內貼著食物, 因為光面反射較強的緣故, 包著的食物因在光滑面較快傳熱, 相反, 若果食物外部易燒焦, 那就要把錫紙光面向外, 熱力因光滑面的反射而減少傳入錫紙包內食物, 令錫紙包內的食物不會太快升溫, 減少焗焦的問題。

以下是從該網站節錄的一小段有關如何用 Aluminum foil (錫紙) 包食物的內容：
Which side of Reynolds WrapR Aluminum Foil should I use, the shiny or the dull side? 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.