In ternary sodium nitrite-sodium nitrate-potassium nitrate eutectic, chromium(III) chloride and potassium dichromate were found to undergo Lux-Flood acid-base reactions to form chromate, which was shown to be soluble and stable. The stoichiometry of the reactions in the presence of the competing basic anions was much more similar to those found in pure nitrite than in pure nitrate melts, but the oxidation of nitrite to nitrate, possibly via nitric oxide and nitrogen dioxide, was shown to be important. All three reactants had spectra which were also much more similar to those in pure nitrite than in pure nitrate melts.