A color magazine is a fixture attached to a follow spot that places different color filters in the path of the beam. Instead of working with comparatively cumbersome gel

Color gel

A color gel or color filter , also known as lighting gel or simply gel, is a transparent colored material that is used in theatre, event production, photography, videography and cinematography to color light and for color correction...

frames, the color magazine allows the spot operator to easily slide color frames in or out of place using a series of levers.

The term boomerang is also used to describe a color magazine.