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Anhydrous hydrofluoric acid also called anhydrous hydrogen fluoride, Anhydrous Hydrofluoric Acid is a toxic, corrosive, nonflammable, liquefied gas packaged in cylinders under its own vapor pressure of 14.1 psia at 70 °F. The gas is colorless, but generates white fumes in moist air. The reaction with water will produce heat and form very corrosive hydrofluoric acid. It has a repulsive, irritating, acidic odor that usually can be detected at low concentrations. Direct skin contact can cause severe burns that may not be immediately painful or visible. Inhalation of fumes can lead to inflammation and congestion of the lungs, and circulatory collapse.