AbstractRecent experimental investigations of interfacial wetting phenomena in binary liquid mixtures characterized by Coulomb or screened Coulomb short range interactions are discussed. Wetting transitions occurring at the fluid‐wall and the fluid‐vapour interface are considered focusing on the examples of fluid alkalimetal‐alkalihalide mixtures and liquid gallium‐based binary alloys at elevated temperatures. Different spectroscopic methods have been employed to probe the respective interfaces, spectroscopic ellipsometry and second harmonic generation (SHG). In the case of K‐KCl solutions the SHG results exhibit changes characteristic of a prewetting transition in metalrich solutions implying a first order wetting transition at coexistence. A wetting transition is observed for liquid Ga‐Bi and Ga‐Pb alloys approaching the monotectic point a