How to show tyndall effect in colloids?

The Tyndall effect in colloids can be demonstrated by
passing a beam of light with a high degree of coherence, like that originating from a
laser pointer, through the colloid.

A beam of light passing
through a medium that does not have any suspended particles that cause the light to
disperse is invisible. For the beam of light to become visible, the photons that
constitute the beam have to be deflected by suspended particles in the medium it is
traveling through. As a colloid consists of particles that can play this role, a beam of
light from a laser pointer passing through it is
visible.

The link below shows a laser beam passing through
a clear solution and through a colloid. The beam is not visible as it passes through the
clear solution but as it enters the colloid it becomes visible.