Carey Leas silver sol is investigated with electron microscopy and analytical methods. Its colloidal behaviour is studied. Coagulation, repeptization and fractionation are described. The Carey Lea sol is not a protected colloid. It consists of small (80 Å diameter) spherical, rather monodisperse, positively charged silver particles. Citrate ions are adsorbed at the particle surface in superequivalent adsorption. © 1969 Dr. Dietrich Steinkopff Verlag.