The Tyndall effect is the scattering of light, indicating that small solid particles are in a substance. It also tells you if that mixture is a solution, colloid, or suspension. If a mixture is a solution, and a light is shone through, then you will not see the beam of light in the liquid. Instead, a dot of light on either side indicates that the particles inside are not big enough the reflect the light. If the liquid happens to be a colloid, then the light will pass through, even if it appears to be homogenous. For a suspension, one of two things can happen. If the particles are the right size then the beam of light will appear. However, if the suspended particles are too large, they will block the light instead of reflecting it.
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