I used the shiny side to make reflector ovens. I am still wanting to build a solar cooker. I just haven't found the right pattern.
When we went camping I made many reflector ovens by using wire hangers, an oven rack and aluminum foil. I got it set up well enough to actually bake biscuits and pizza. I still wonder how they built reflector ovens before aluminum foil?
I put the shiny side up if I want my dish to stay cool. The dull side up if I am cooking with the foil.
That having been said, I rarely use aluminum foil. I did yesterday because I couldn't find the lids to most of the dishes I was transporting. I think that is the first time in more than a year I have used foil. I guess I haven't been going a lot and I do have many covered containers.
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