Is it poisonous to put metal cup inside freezer?
No.I was brought up to believe this also.but here is the REAL reason why you might not want to freeze in a metal containerOn One Hand: Metal Containers Can Prevent Freezer Burn When water molecules escape a food through its packaging in the freezer, freezer burn can resultFreezer burn isn't harmful on its own, but it can signal a resulting deterioration of the food, especially if the food has a lot of freezer burnA benefit of using a metal pan or dish or aluminum foil to store items in the freezer is that water molecules are less able to evaporate from the food through the metal thus resulting in less freezer burnOn the Other: Certain Metals Can React with Acidic Foods Acidic foods, including certain fruits such as berries, will react with certain metals and take on an unsavory flavor and appearanceReactive metals include copper, cast iron and aluminumStainless steel is much more resistant to this reaction, and would be a better choice than aluminum for storing acidic foods in the freezerBottom Line While acidic foods are best stored for long periods in a freezer in stainless steel or plastic, most foods store well in metal containers, including aluminum foil, because they are less likely to get freezer burn than they would in paper or paperboardJust make sure that the food is well sealed before freezing.
