Composite particle comprised of composite particles in which edible core particles are encapsulated with a coating comprising a material that forms a propellant gas when contacted with an edible acid in a solution such that the composite particles independently move in the solution sufficient to create a visual effect. The movement of the composite particles creates an interesting and enjoyable optical effect. In one embodiment, these composite particles are included in powdered beverage mixes including an edible acid which are reconstituted into drinking beverages having the optical effect imparted by the movement of the composite particles in solution.