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. 546.