Differential interference contrast (DIC) light micrograph of a bubble lattice of shampoo foam with glitter particles. Glitter particles in shampoo are tiny pieces of reflective material that are added to give the shampoo a shiny or sparkling appearance. These particles are typically made from small pieces of plastic or metal, such as aluminium, that have been coated with a reflective material, such as mica or titanium dioxide. While glitter particles may add a fun and visually appealing touch to shampoo, they do not serve any functional purpose in terms of cleaning or conditioning the hair. In fact, some people may find that glitter particles can be irritating to the scalp or difficult to rinse out of the hair.