because as the foil goes through rollers when it is made the side that is against the rollers gets shiny and the side that's against the other foil becomes matte
Shiny
On Reynolds aluminum company website you'll find :Which side of Reynolds Wrap® Aluminum Foil should I use, the shiny or the dull side?Actually, it makes no difference which side of the aluminum foil you useboth 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 composition of aluminum foil is NOT 100% pure aluminum, as many people believe. You may have noticed that aluminum foil always seems dull on one side, and shiny on the other. This is caused by a naturally-occurring reaction. When Aluminum comes into contact with oxygen, the two elements undergo a spontaneous reaction: 4 Al(S) + 3 O2 (G) => 2 Al2O3 (S) The aluminum foil reacts with oxygen in the air to form a thin layer of Aluminum Oxide on one side of the foil. Because rolls of aluminum foil are generally rolled tightly, the inner side of the aluminum foil is not exposed to the air as much, and it remains shiny. In short, the composition of aluminum foil is pure aluminum (Al) AND aluminum oxide (AL2O3). (And don't worry-- the layer of aluminum oxide on aluminum foil is completely harmless. We've been using foil to cover food for years, after all.)
Not in aluminum foil. Aluminum foil is all aluminum. Large pieces of refined aluminum (blocks weighing over a thousand pounds) are rolled and rolled until a sheet of foil a fraction of an inch thick results. Some 50 miles of foil are rolled onto a spool at the end of the line. And two sheets are rolled out at the same time, one pressed to the other. That's why aluminum foil has a shiny side and a dull side. The dull sides are the "inside" where the two sheets are pressed together in the manufacturing process. If you have a chance to see the process, go look. If you want a virtual tour, use the link and watch the video on how foil is made. It's really cool!
No. Aluminum will degrade faster than most metals, especially if it is left in salt water, such as at the bottom of the ocean. This is true. Aluminum foil is not biodegradable. your welcome, : )
There is no discernible heat retention difference between the shiny or the dull side of aluminum foil. The shiny side is shiny because of the way foil is made. During the last pass through the rolling mill, a double thickness of foil is run between the rollers. The side of each sheet that comes in contact with the polished steel rollers comes out shiny. The other side has a matte finish.
Shiny
On Reynolds aluminum company website you'll find :Which side of Reynolds Wrap® Aluminum Foil should I use, the shiny or the dull side?Actually, it makes no difference which side of the aluminum foil you useboth 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.
it is all the same either way.
If you are baking something wrapped in foil, you should probably have the dull side of the foil out. The dull side reflects heat a bit less than the shiny side. This means that cooking with the shiny side out would make your food cook more slowly.
The composition of aluminum foil is NOT 100% pure aluminum, as many people believe. You may have noticed that aluminum foil always seems dull on one side, and shiny on the other. This is caused by a naturally-occurring reaction. When Aluminum comes into contact with oxygen, the two elements undergo a spontaneous reaction: 4 Al(S) + 3 O2 (G) => 2 Al2O3 (S) The aluminum foil reacts with oxygen in the air to form a thin layer of Aluminum Oxide on one side of the foil. Because rolls of aluminum foil are generally rolled tightly, the inner side of the aluminum foil is not exposed to the air as much, and it remains shiny. In short, the composition of aluminum foil is pure aluminum (Al) AND aluminum oxide (AL2O3). (And don't worry-- the layer of aluminum oxide on aluminum foil is completely harmless. We've been using foil to cover food for years, after all.)
Not in aluminum foil. Aluminum foil is all aluminum. Large pieces of refined aluminum (blocks weighing over a thousand pounds) are rolled and rolled until a sheet of foil a fraction of an inch thick results. Some 50 miles of foil are rolled onto a spool at the end of the line. And two sheets are rolled out at the same time, one pressed to the other. That's why aluminum foil has a shiny side and a dull side. The dull sides are the "inside" where the two sheets are pressed together in the manufacturing process. If you have a chance to see the process, go look. If you want a virtual tour, use the link and watch the video on how foil is made. It's really cool!
The "inside" of tin foil is the dull side. The "outside" of tin foil is the shiny side.
the right side
If loosely tented immediately with aluminum foil (shiny side in), a cooked chicken will keep warm for about 30 mins.
A mirror, or the shiny side of tin foil
It is a result of the rolling process, manufacturers roll a large ingot of aluminum through successivly smaller thickness of roller so the ingot gets thinner and thiner, however for the very last roll the aluminum is to thin to be rolled alone, so they put through two sheets, the sides which face each other become dull.