Preferably, each of the silicate particles includes up to about 10 wt. %, preferably up to about 5 wt. % water without providing such a pathway for diffusion from the particle to the solvent. [0103] Any silicate that is soluble in water or a water solution of a water miscible organic material, such as an alcohol, acetone or dimethylformamide, can be used in the silicate particles of the invention.