ColorS (色替 Karāzu) is a common Magic Item.
ColorS takes the form of a small book with an intricately decorated cover, bearing the device's name. In the anime, it closely resembles a rectangular box, with its front decorated by the object's name, placed almost in its center, and by a pair of round, mirror-like objects or drawings superimposed on, from the top to the bottom, a darker-colored rectangle with jagged borders and a decorated round drawing resembling a mirror's frame, which is in turn surrounded by four decorations, reminiscent of arrows pointing outwards.
Color Alteration: ColorS can be used to change the color of the clothes the user is wearing, just by sliding over the mirror-like surface on the item. It is popular among girls.