A bath for the electrodeposition of white gold alloys of interest for the electroforming of hollow jewellery is proposed and investigated. The system was an acidic Au(III)-Sn(IV) bath for the electrodeposition of Au-Sn alloys. The electrochemical investigations were based on cyclic voltammetry, linear-sweep voltammetry, galvanostatic electrodeposition experiments and in situ Raman spectroscopy. The electrode kinetics of alloy formation were elucidated by stripping voltammetry. The effects of cathodically adsorbed CN- were studied by in situ Raman spectroscopy. Electrodeposited foils were studied from the crystallographic, compositional and morphological points of view. Codeposition of Au and Sn gives rise to a single phase of approximately equiatomic composition over a current density interval of 10 to 40 mA cm(-2). This orthorhombic phase is structurally the same as the zeta' phase of the equilibrium Au-Sn system, but its stoichiometry and lattice parameters are different. The equilibrium two-phase delta, zeta' structure can be obtained by heat-treatment.