Coloring agents, favors and fragrances:

Organoleptic agents, such as colorants, flavors or fragrances should not normally affect the physical stability of topical or oral suspensions. On the other hand, since many flavoring agents and fragrances are water-insoluble, oily liquids that are usually added to the batch in the final phase after the primary physical stability of the suspension has been established and thereby influence the physical stability of the final suspension.