A colloid is any substance that is made of particles that are of an extremely small size- larger than atoms but generally have the size of 10^-7 cm ranging to 10^-3 cm. Traces of electrolytes stabilizes the colloids. Dialysis is the separation of colloids from dissolved ions or molecules of small dimensions, or crystalloid, in a solution. Thus, on prolonged dialysis, electrolytes are separated thereby destabilizing the colloids.