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(xxiv) Dialysis, Electro dialysis, ultrafiltration and ultracentrifugation.
(xxv) Dialysis is a process of removing a dissolved substance from a colloidal solution by means of diffusion through a sustainable membrane.
(xxvi) Ultra filtration is the process of separating the colloidal particles from the solvent and soluble solutes present in the colloidal solution by specially prepared filters, which are permeable to all substances except the colloidal particles.
(xxvii) It can be made faster by applying an electric field if the dissolved substance in the impure colloidal solution is only an electrolyte and the process is called Electro dialysis.
(xxviii) The colloidal particles settle down at the bottom of the tube and the impurities remain in solution.