Which of the following is NOT a property of a colloid?

A colloid is not a homogeneous mixture; it is a heterogeneous mixture in which very small particles are dispersed throughout another substance. Particles of a colloid are larger than those in a true solution but smaller than those in a suspension. Due to their small size, colloidal particles do not settle down when left undisturbed. They also cannot be separated by ordinary filtration because their particles can pass through filter paper. Colloids show the Tyndall effect, meaning they scatter a beam of light passing through them. Examples include milk, fog, smoke, and starch solution.