In a benzene medium, common salt which is a typical crystalloid in an aqueous medium acts as a colloid. As a result, we can claim that colloidal substances do not belong to a distinct class of substances. It behaves as a colloid when the size of the solute particle is between 1 nm and 1000 nm.

As a result, we may conclude that colloid is not a substance but a condition of a substance that is determined by particle size. Between a real solution and a suspension, a colloidal condition exists.