metal spoon eaten by very strong acid

watch what happens with a spoon when it comes in contact with a very strong acid. Don't click away too, soon there's a surprise! Kidding! This is a spoon made of a gallium-aluminum alloy which reacts with water. Aluminum is actually quite a reactive metal, meaning that it readily reacts with water if not for the oxide layer that protects the metal. When alloying aluminum with gallium, this aluminum oxide layer can't form thus enabling aluminum to react with water. The bubbles are harmless(but flammable) hydrogen gas, and the gray stuff is the equally harmless aluminum hydroxide. (2 Al + 6 H2O → 2 Al(OH)3 + 3 H2)