TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The acidic reagent is brought into contact with the boron hydride at more than one distribution point via a multi-channel distributor. The liquid distributor comprises a valve having many acidic reagent ports. The acidic reagent is brought into contact with the boron hydride fuel via a multichannel liquid distributor. The acidic reagent is fed through alternate valve ports in sequence. Preferred Components: The fuel comprises: at least one borohydride salt of formula (M(BH4)n); salt comprising triborohydride salts of formula (M(B3H8)n), decahydrodecaborate salts of formula (M2(B10H10)n), tridecahydrodecaborate salts of formula (M(B10H13)n), dodecahydrododecaborate salts of formula (M2(B12H12)n) or octadecahydroicosaborate salts of formula (M2(B20H18)n); or at least one hydrated borohydride composition of formula (M(BH4)n+X H2O) comprising water 50-60 wt.%. The fuel further comprises a stabilizer agent comprising metal hydroxides, anhydrous metal metaborates and/or hydrated metal metaborates. The acidic reagent comprises an aqueous solution of at least one acid at 1-60 (preferably 20-40) wt.% and an additive at 0.1-10 (preferably 0.2-3) wt.%. The acidic reagent comprises a material comprising hydrochloric acid, sulfuric acid, phosphoric acid, acetic acid, formic acid, maleic acid, malic acid, citric acid or tartaric acid.M = alkali metal cations, alkaline earth metal cations, aluminum cation, zinc cation or ammonium cation;X = 1-5; andn = corresponds to the charge of the selected M cation.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The multi-channel distributor comprises a multi-port valve, a multi-channel nozzle, and a multi-port sprayer or atomizer. The control mechanism comprises a timer. Preferred Method: The control mechanism is configured to minimize diffusion paths of the reagent through reacted fuel to reach unreacted fuel. The first and second regions are bounded by a movable partition to provide a volume exchanging configuration or a flexible material to provide a volume exchanging configuration.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The fuel is a solution, slurry or solid. The additive comprises a material comprising ethers of diols, amines, amino alcohols, amides, fused ring heteroaromatics, 1,2-dimethoxyethane (glyme), diethylene glycol dimethyl ether(diglyme), triethylene glycol dimethyl ether (triglyme), tetraethylene glycol dimethyl ether (tetraglyme), dimethylacetamide, ethylene diamine, pyranthrenedione, indanthrene pigments, violanthrone pigments, 3,4,9,10-perylenetetracarboxylic diimide pigments, quinacridone pigments, 1,4-diketopyrrolo(3,4-c)pyrrole pigments, copper phthalocyanine, indigo dye, methanol, ethanol, ethylene glycol, propylene glycol, tetrahydrofuryl alcohol or 2-aminoethanol. The acid is sulfuric acid and the additive is ethylene diamine, 2-methoxyethyl ether (diglyme), pyranthrenedione, maleic acid, tetrahydrofuryl alcohol or ethylene glycol. The additive comprises a carboxylic acid at 0.2-3 wt.% of the solution. The carboxylic acid is maleic acid, citric acid, malic acid or acetic acid. EXAMPLE - Hydrated sodium borohydride/sodium hydroxide fuel composition (comprising borohydride (47.5 wt.%), hydroxide (2.5 wt.%), and water (50 wt.%)) were reacted with sulfuric acid solutions with concentrations of 27-50 wt.%.