Golden hydrophilic foil
Anti-corrosion Aluminum Foil, including organic gold, high water resistance, is mainly used in Air Conditioners, Refrigerators and other refrigeration equipments. It can be used in bad environment due to its higher antiseptic properties.
https://www.acreemetal.com/aluminum-foil-and-stainless-steel-sheet/golden-hydrophilic-foil.html