The aluminium foil is created when the molten aluminium is poured onto a flat surface. The aluminium foil typically has an aluminium edge on one side, which is dull compared to the shinier side created by the material being cast into the desired form. The casting process includes heating metal until it is molten and then pouring it onto a flat surface. When the metal begins to cool, it hardens. The molten aluminium is then said to have been cast into its desired form, which typically includes sharp bends and creases due to how quickly it cools.
The shiny side of aluminium foil occurs on the top layer because the material is cast into a thin sheet during production, making this part more solid than the rest of the foil once it has cooled down. This glossy side of aluminium foil typically faces up when placed onto counter-tops or other work areas. However, there are some instances where this standard rule may not apply. For example, if someone uses a sharp knife to cut through sheet after sheet of aluminium foil, they will notice that each cut is only visible on one of the two sides of the foil. These cuts are because the shiny side cannot be seen since it can only be created with a single sheet, whereas the dull side has already been made when two sheets are placed together.
You may find that placing aluminium foil into an oven with food inside will intensify the shininess of one side over the other after cooking, making them duller side appear brighter in color. You may also notice that this rule applies to other substances made from aluminium, such as beverage cans or large buckets, which have a shinier and less reflective appearance on one side compared to another.
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