Cyclic voltammetry was used to verify the presence of Mg2+ and the 8:3 stoichiometry of Al2Cl7- to Mg. The precipitate formed was identified as Al and quantified by inductively coupled plasma (ICP) spectroscopy. Based on other ICP measurements;the concentration of Mg2+ (Or Other soluble forms of magnesium) was found to be at least 0.274 M, or about 77% of the amount predicted by the above reaction. Thus, very little, if any, Mg appears to precipitate from the buffered melts. Mg is also oxidized in basic melt, but a yellow color develops suggesting reaction with the organic portion of the melt. Thus, while buffering of basic melts is best carried out by adding MgCl2, Mg metal is the agent of choice for buffering acidic melts.