Difference between Suspension and Colloids

Suspension 

Colloid

Suspension is a heterogeneous mixture of substance.

Colloidal solution appears as a homogeneous mixture, but it also can exist as a heterogeneous mixture as well.

Particle size is comparatively large.

Particle size is comparatively small.

Particles can settle down under the influence of gravity if the settling process is not disturbed.

Particles in a colloid do not settle down under normal conditions.

Particles cannot pass through a filter paper.

Particles can pass through a filter paper.

Optical properties of a suspension are opaque because they do not transmit light.

Optical properties of a colloid are opaque or translucent because they can scatter light.