I dealt with liquid oxygen during my career, but never saw the actual substance. Interesting that it has color*.
Liquid oxygen—abbreviated LOx, LOX or Lox in the aerospace, submarine and gas industries—is the liquid form of molecular oxygen. It was used as the oxidizer in the first liquid-fueled rocket invented in 1926 by Robert H. Goddard, an application which has continued to the present. Liquid oxygen has a pale blue color and is strongly paramagnetic: it can be suspended between the poles of a powerful horseshoe magnet.*discussed here and here. "The transition responsible for the pale blue color of liquid oxygen is the simultaneous excitation of two molecules from triplet sigma to singlet delta. The double excitation avoids the spin forbiddeness." In other words, apparently it's some form of magic.