This is because there are solid particles suspended in the mixture although it is more stable than a suspension.
Light is scattered by colloids.
colloid
colloid
Shine a light through it. If there are particles scattered, then it's a colloid
Use the Tyndall Effect shine a light through it. If the light is scattered then it is colloidal. Both colloids and suspensions are heterogeneous. A solution will not show the beam through it's substance but the colloid will. The particles in the suspension will eventually settle at the bottom, showing that it is NOT a solution.
colloid
no
Light is scattered as it passes through a prism.
No
a colloid
no
A colloid is cloudy and thick and will not allow light to pass through, whereas a suspension is clear and transparent and lets light pass through it.