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Diborane (B2H6) is the simplest hydride of boron. Of all the boron hydrides, diborane is the most easily prepared in pure form. Diborane is a colourless gas in its normal state, exhibiting a sweet odour. It hydrolyses in water to yield boric acid and hydrogen. It is soluble in carbon disulphide, and reacts slowly with bromine. Diborane reacts with any oxidised surface as a strong reducing agent. It should be stored at temperatures below 20 deg C, and will decompose slowly during storage. At temperatures of approximately 100 deg C, diborane decomposes into hydrogen, tetra-borane, pentaborane, and solids. It is an extremely toxic propellant.