NOVELTY - An acid-reactive alloy composition comprises (in wt.%) magnesium (30-40), zinc (40-55), iron (2-5), and calcium (4-12).    USE - For hydrogen generation.    ADVANTAGE - The inventive acid-reactive alloy composition provides for efficient and controllable method of producing hydrogen upon exposure to an acidic medium. The iron content of alloy composition may create iron oxide upon exposure to acidic fluid, which is disposed in an approved manner either by an in-situ or ex-situ plan. The other components of alloy composition do not create any hazard known at this time and that all other components can go directly into a liquid waste system or into land.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) production of acid-reactive alloy composition by supplying an amount of magnesium and zinc; placing magnesium and zinc into a container; heating up the container; supplying a stream of inert gas into the container during the heating step; continuing the heating of container up to a predetermined temperature at which the magnesium and zinc liquefy; stirring the magnesium and zinc as they begin to liquefy; adding an amount of iron to liquefied magnesium and zinc; adding an amount of calcium to liquefied magnesium and zinc to form an alloy composition containing magnesium, zinc, calcium and iron; providing continuous stirring once magnesium and zinc begin to liquefy; reaching a target temperature once the magnesium, zinc, iron and calcium are mixed with each other; and introducing resultant alloy composition into a mold; and    (2) generation of hydrogen by producing an acid-reactive alloy composition; supplying a container capable of containing the acid-reactive alloy composition and an acidic fluid; allowing the acidic fluid and the alloy composition to react; and generating an amount of hydrogen upon reaction of acidic fluid with the alloy composition.    DESCRIPTION OF DRAWING(S) - The figure is a block flow diagram illustrating a method of producing the inventive acid-reactive alloy composition.