T Y N D A L L E F F E C T
"The Tyndall Effect is the effect of light scattering in colloidal dispersion.
Because a colloidal solution or substance is made up of scattered particles (like dust and water in air), light cannot travel straight through. Rather, it collides with these micro-particles and scatters causing the effect of a visible light beam. This effect was observed and described by John Tyndall as the Tyndall Effect."