Thus, we refer to this liquid state phenomenon as the a) Electronic mail: ondrej.marsalek@mff.cuni.cz b) Electronic mail: hanns christian.schewe@uochb.cas.cz c) Electronic mail: pavel.jungwirth@uochb.cas.cz electrolyte-to-metal transition (EMT). In contrast to supercritical mercury, alkali metals dissolved in liquid ammonia do not exhibit a sharp transition, but a gradual one in the concentration range of about 1-10 MPM (mole percent metal; in liquid ammonia, 1 MPM equals to roughly 0.4 M). 2,5 Three historical models have been suggested for the EMT in alkali metal-liquid ammonia systems: 2 (i) a percolation model based on experimental findings of microscopic inhomogeneities, (ii) an extension of the Landau and Zeldovich model introducing a critical electron density for metallisation, and (iii) a model linking the transition to a polarisation catastrophe. Despite these efforts, the molecular mechanism underlying the EMT remains inconclusive.