I imagine that there are serious regulations regarding the transport of metallic mercury. IIRC you don't ever want it near an airplane in case of a spill. I believe that mercury or the vapour acts as a catalyst which causes aluminum to break down or oxidize. When i was young, I put some mercury in an aluminum dish and a couple of days later; there was a white mass surrounding the mercury and the aluminum was seriously pitted. I have about 10 lbs that I should look into recycling.