Colloid Colloid Colloids Colloids are mixtures containing particles that are intermediate in size between those of true solutions and suspentions. Colloidal particles exhibit the Tyndall effect.
Light is reflected in all directions from particles in colloids.
The Tyndall effect is not observed with a true solution. Coagulation Charged colloidal particles form aggregates and precipitate from the dispersion when ions of opposite charge are added.