DO NOT rely on the absence of a plume as evidence of nitrogen release. Check the caps to make sure they have not become sealed by frost accumulation. Exposure, which may be too brief to affect the skin of the face or hands, may damage delicate tissues. Extensive tissue damage or burns can result from exposure to liquid nitrogen or cold nitrogen vapors. Loosen clothing that may restrict circulation.
Frozen tissues are painless and appear waxy with a pallid yellow color.
Persons suffering from a lack of oxygen should quickly be moved to areas with normal atmosphere. If the victim is not breathing, assisted ventilation should be initiated. Boiling and splashing always occur when filling a warm container with cryogenic liquid or when inserting objects into these liquids. Perform tasks slowly to minimize boiling and splashing. The container should be appropriately vented to prevent over pressurization.