Han Solo in Carbonite
"The carbon freezing process was used to store and preserve Tibanna gas extracted by Cloud City from Bespin's atmosphere. The gas was mixed with molten carbon and flash-frozen for transport to far-off trading centers. Solo's experience proved that a human can be successfully frozen in carbonite, remaining alive but ""suspended"" in time. Upon release from this deep-freeze, a human would experience extreme weakness and temporary loss of sight."