An easy way of determining whether a mixture is colloidal or not is through the observation of the Tyndall effect. The Tyndall effect happens when light passes through a mixture. If you see the light beam clearly, it means the mixture is colloidal because the particles are big enough to scatter light.Example:Colloidal mixture (like milk): light is visible → Tyndall effect observedTrue solution (like saltwater): light is not visible → No Tyndall effect.