Yes, it should be just fineI would spray it down with some no-stick or wipe it with a little vegetable oil just to be on the safe side, but the foil will not really make a differenceMake sure it stays smooth on the baking sheet thoughIf you have a wrinkle, it could catch in the biscotti and it would make the cookie stick.
Yes it is a suitable emergency subI would spritz(not looking to change the macaroons texture) it with some Pam to avoid macaroons stuck to the foil or the other way aroundGet too happy with the Pam and it won't be nice to your macaroonsMake sure your foil is FLATRemove roll from box/packageLay roll over baking sheetGive it a little push and let it unroll the proper amountCut with scissors CAREFULLYThe wrinkles would make your cookies ugly, well aesthetically speaking it wouldThey also wouldn't brown evenlyShiny side of foil or dull side? First the howFoil must be doubled to avoid tearing in the manufacturing rollersFoil is just so thinThis means the shiny side was against the rollers and the dull side was against the second layer of foilShiny side upThe reflective properties of the foil do impact baking results but not to the extent some would like to suggestThe differences between dark and light is not as pronounced as say a bright aluminum pan and a dark non-stick panBaking times vary when using different types of dishes but the difference is so small where foil is concerned so just keep the shiny side up for presentation reasons.
Martin's answer is mind bogglingSo well thought out too!! You need to start very young and say :when I grow up I want to be an astronautThen you need to run around in aluminum foil wrapped around you with a fish bowl on your head and a dryer hose glued to itAttach two thermos bottles to your back and glue the other end of the dryer hose to themWrap foil around a big box and get in it saying : The Eagle has landed Carry around an American flag and stab it into the ground saying : One small step for a man, one giant leap for mankind It just takes practiceGO FOR IT!!
