tyndall effect : colloidal particles have dimensio these are reversible upon heating e.g. organics in water
adsorption colloids have high surface area and hence have a lot of active surface for adsorption to occur the stability of colloids is mainly due to preferential adsorption of ions there are two types of colloids
lyophobic colloids that are solvent hating these are irreversible upon hea-ting e.g. inorganic colloids metal halides
lyophilic colloids that are solvent loving these are reversible upon heating e.g. organics in water