Journal of the Electrochemical Society
A study of supersaturated zincate solutions is made using light scattering and nuclear magnetic resonance techniques. The results indicate strongly that the excess zinc is present as a solute species rather than in a colloidal form. The solute species appears to be the same as that in solutions of ZnO in aqueous KOH, viz., Zn(OH)42-. There is no strong evidence to indicate the presence of other solute species.
Van Doorne, W. and Dirkse, T. P., "Supersaturated Zincate Solutions" (1975). University Faculty Publications and Creative Works. 546.