Color theory primary colors work at all is that the imperfect pigments being used have sloped absorption curves, and thus change color with concentration. A pigment that is pure red at high concentrations can behave more like magenta at low concentrations. This allows it to make purples that would otherwise be impossible. Likewise, a blue that is ultramarine at high concentrations appears cyan at low concentrations, allowing it to be used to mix green. Chromium red pigments can appear orange, and then yellow, as the concentration is reduced. It is even possible to mix very low concentrations of the blue mentioned and
Orange (colour) signal fire, historically used at night while smoke was used during the day, to communicate with distant army units. In the Indonesian Air Force, the Air force infantry and special forces corps known as Paskhas uses Orange as their beret colour. Several corporate brands use orange, such as Blogger, Fanta, FedEx, GlaxoSmithKline, Gulf, Hankook, Harley-Davidson, ING, Jägermeister, Nickelodeon, Orange, the Women's National Basketball Association, The Home Depot and TNT. Orange, because of its common association with activity and visibility, is a popular colour for sports teams. Orange (colour) Orange is the colour between yellow and red on the spectrum of