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This solution absorbs acetylene with the precipitation of red cuprous acetylide, Cu2C2, a very explosive compound.

This second method of production has the great drawback that, unless proper precautions are taken to purify the gas obtained from the copper acetylide, it is always contaminated with certain chlorine derivatives of acetylene.

Cuprous carbide, however, is very unstable and prone to oxidation; so that, given the opportunity, it combines with oxygen or hydrogen, or both, until it produces the copper acetylide, or acetylene-copper, which is explosive—a body to which Blochmann's formula C_2H_2Cu_2O is generally ascribed.

His conclusions are that a copper acetylide is always produced if impure acetylene is allowed to pass through neutral or ammoniacal solutions of copper; that dry acetylene containing all its natural impurities except ammonia acts to an equal extent on copper and its alloys, yielding the explosive compound; that pure and dry gas does not act upon copper or its alloys, although it is possible that an explosive compound may be produced after a great length of time.

Mahler, temperature of flames, Mai and Freund, copper acetylide, Mains, deposition of liquid in, diameter of, and explosive limits, dimensions of, escapes from, friction in, laying of, lead, quality of, removing air from, testing of, Make of acetylene from carbide, in generators, Manchester burners, Maneuvrier and Fournier, specific heat of acetylene, Manganese carbide, Mantles for acetylene, Manure for generator protection, Manurial value of generator residue, Maquenne.