Aluminum foil is one of those things that are available in almost every kitchen cabinet. These huge rolls come in handy during our cooking adventures. But have you ever noticed how the single tinfoil has contrasting colors on either side?
Do you know why one side looks shiny and polished while the other is dull in comparison? Well, don’t worry, I will tell you all about it. To understand this process in-depth, we have to go back all the way to manufacturing.
The process of making these useable foils is called “The Bayer’s Process.” Initially, the aluminum oxide is heated to obtain a pure form of aluminum. Then, its added with other elements in the furnace, which are later extracted.
The liquid state of aluminum is 99.9% pure form. Hence, the elements added in manufacturing are not mentioned on the box. Now comes the cooling section. This molten form of aluminum is then cooled into solid ingots.
Finally, the ingots go through a heating process where they are pressed into superthin layers, or “foils.” These foils are really thin, so two lines are merged to create one line of the foil. This process also avoids tearing. In terms of being shiny, the sheet that directly undergoes the roller has a shinier finish than the other side.
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