Quote Originally Posted by slick

When using tin foil does the shiny side go up or down?
What's the difference between the shiny side and the dull side?
Durned if I know!

But Mr. Google found out ...
http://www.alcoa.com/reynoldskitchen...89&cat_id=1337

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 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.

Which is better for freezing, aluminum foil or plastic?
Aluminum foil has the lowest moisture-vapor transfer rate of all wrapping materials. This means that it is the most effective in preventing the loss of moisture and vapor from the food. This is the reason why foil is preferred over plastic wrap for long-term food storage or freezing.
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Good thing God invented the 'puter ...
or I'd never be able to boil water & cook Mac 'n Cheese!