I once had to travel with a vial of bromine. Besides sealing it up pretty tight. I had a plan if I was caught getting on the plane - tell them it was cow's bloo

I once had to travel with a vial of bromine. Besides sealing it up pretty tight. I had a plan if I was caught getting on the plane - tell them it was cow's blood, which shouldn't be very terrorizing. If I was caught getting off the plane I'd tell them it was bromine because cow's blood would be disallowed by customs.