The term ceramic is frequently used when nitrate and oxide coatings are used in window film construction. During the coating process, nitrogen and/or oxygen are introduced into the sputtering chamber in conjunction with a negative electrical charge and argon gas. By introducing these gases, the target metal is transformed into a non-metallic ceramic. The appearance of the coating changes drastically and is less reflective in appearance compared to a metalized coating. Hence the term ceramic, as the coating is no longer metal with metal properties and appearance.