Which of the following is not true about colloids?

The properties of colloids are as follows:

• A colloid is a heterogeneous mixture.
• The size of the particles of a colloid is too small to be individually seen by the naked eye.
• Colloids are big enough to scatter a beam of light passing through them and make their path visible.
• The components of the colloid can be separated by centrifugation.
• So the statement - 'Colloids cannot scatter the beam of light'  is not true.