TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The metal hydride compound comprises at least one of alkali and alkaline earth metal hydrides, borohydrides and aluminum hydrides. It also comprises at least one of sodium borohydride (NaBH4), potassium borohydride, lithium borohydride, beryllium borohydride, calcium borohydride, magnesium borohydride, NaCNBH3 (sic), lithium hydride, sodium hydride, potassium hydride, calcium hydride, beryllium hydride, magnesium hydride, sodium aluminum hydride, lithium aluminum hydride, or potassium aluminum hydride. The hydroxide ion providing compound comprises alkali and alkaline earth metal hydroxide(s) and ammonium hydroxide. The hydroxide ion providing compound comprises at least one of lithium hydroxide, rubidium hydroxide, cesium hydroxide, calcium hydroxide, magnesium hydroxide, barium hydroxide, ammonium hydroxide, preferably sodium hydroxide or potassium hydroxide (KOH). Preferred Composition: The hydroxide ion is greater than or equal to 7.5, preferably greater than or equal to 8 moles/L. The concentrate contains metal hydride compound at greater than or equal to 3 moles/L. Preferred Property: Upon storage of the concentrate for 1 year at 25degreesC, not less than)5%, preferably not greater than 2% of the metal hydride compound have decomposed.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The metal hydride compound comprises at least one of alkali and alkaline earth metal hydrides, borohydrides and aluminum hydrides. It also comprises at least one of sodium borohydride (NaBH4), potassium borohydride, lithium borohydride, beryllium borohydride, calcium borohydride, magnesium borohydride, NaCNBH3 (sic), lithium hydride, sodium hydride, potassium hydride, calcium hydride, beryllium hydride, magnesium hydride, sodium aluminum hydride, lithium aluminum hydride, or potassium aluminum hydride. The hydroxide ion providing compound comprises alkali and alkaline earth metal hydroxide(s) and ammonium hydroxide. The hydroxide ion providing compound comprises at least one of lithium hydroxide, rubidium hydroxide, cesium hydroxide, calcium hydroxide, magnesium hydroxide, barium hydroxide, ammonium hydroxide, preferably sodium hydroxide or potassium hydroxide (KOH). Preferred Composition: The hydroxide ion is greater than or equal to 7.5, preferably greater than or equal to 8 moles/L. The concentrate contains metal hydride compound at greater than or equal to 3 moles/L. Preferred Property: Upon storage of the concentrate for 1 year at 25degreesC, not less than)5%, preferably not greater than 2% of the metal hydride compound have decomposed.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The metal hydride compound comprises (CH3)3NHBH3. The solvent comprises at least one of water, an aliphatic alcohol having up to 6C and up to 4 hydroxy groups, 2-4C alkylene glycol, a di(2-4C alkylene) glycol, a mono-1-4C-alkyl ether of a 2-4C alkylene glycol or a di(2-4C alkylene) glycol, a di-1-4C-alkyl ether of a 2-4C alkylene glycol or di(2-4C alkylene) glycol, an aliphatic ether having up to 6C, an aliphatic ketone having up to 6C, or 1-3C alkyl ester of a 1-3C alkanoic acid. It may also comprise at least one of water, methanol, ethanol, ethylene glycol, diethylene glycol, glycerol, acetone, methyl ethyl ketone, diethyl ketone, methyl acetate, ethyl acetate, dioxan, tetrahydrofuran, diglyme or triglyme. EXAMPLE - 22.4 g KOH was dissolved in 80 ml deionized water and cooled to room temperature. 15.12 g NaBH4 was dissolved in the resultant solution with stirring for 30 minutes. Then water was added to a final volume of 100 ml. This solution contained 4 M KOH and 4 M NaBH4. The solution (100 ml) was placed in a flask and equilibrated at 70degreesC for 10 minutes to obtain thermostatic conditions. The evolution of hydrogen was measured by determining the amount of displaced water. The hydrogen evolution rate was determined to be 1.42 m/minute.