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However, there are two easy ways to identify a colloid: 1  Components of a suspension separate over time. 2  If you shine a beam of light into a colloid, it displays the Tyndall effect, which makes the beam of light visible in the colloid because light is scattered by the particles.
Homogeneous mixtures with a dispersed phase in this size range may be called colloidal aerosols, colloidal emulsions, colloidal foams, colloidal dispersions, or hydrosols. The dispersed-phase particles or droplets are affected largely by the surface chemistry present in the colloid. Some colloids are translucent because of the Tyndall effect, which is the scattering of light by particles in the colloid. Other colloids may be opaque or have a slight color.