Tertiary color if they exist at all, though indigo and scarlet are standard for blue–violet and red–vermilion. In another sense, a tertiary color is obtained by mixing secondary-colored pigments. These three colors are russet (orange–purple), slate (purple–green), and citron (green–orange), with the corresponding three quaternary colors plum (russet–slate), sage (slate–citron), buff (citron–russet) (with olive sometimes used for either slate or citron). Beyond that are shades of grey (blue grey and brown greys), which approach but never quite reach black. The RYB color terminology outlined above and in the color samples shown below is ultimately derived from the 1835 book "Chromatography", an analysis
Red Color Red Color The Red Colour (, transl.: "Tzeva Adom") is an early-warning radar system installed by the Israel Defense Forces in several towns surrounding the Gaza Strip to warn civilians of imminent attack by rockets (usually Qassam rockets). Outside of areas serviced by the Red Color system, standard air raid sirens are used to warn of rocket attacks. The system currently operates in a number of southern Israeli cities within range of missiles fired from the Gaza Strip, including Sderot. When the signature of a rocket launch is detected originating in Gaza, the system automatically activates the public broadcast warning