I want to understand what are the particles of a colloid in the microscopic scale. According to Wikipedia:
A colloid is a phase separated mixture in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance.
What I can't understand is how we can have a phase seperation when we have soluble particles? I looked for some pictures and I got more frustated. For example in the following picture Colloids:
the particles seem to be like ordinary atoms/molecules just scaled up. So how can this particles exhibit bulk properties and classified as "solid" particles? Is the picture a simplification? I mean should colloid particles be represented as clusters forming a phase (e.g. solid) that is invisible to human eye?