In modern color theory, also known as the RGB color model, red, green and blue are additive primary colors. #China colorful gamer headset quotes manualPainters in the Renaissance mixed red and blue to make violet: Cennino Cennini, in his 15th-century manual on painting, wrote, "If you want to make a lovely violet colour, take fine lac, ultramarine blue (the same amount of the one as of the other) with a binder" he noted that it could also be made by mixing blue indigo and red hematite. On the color wheel long used by painters, and in traditional color theory, red is one of the three primary colors, along with blue and yellow. Red light is used to help adapt night vision in low-light or night time, as the rod cells in the human eye are not sensitive to red. This may have driven further adaptations by species taking advantage of this new ability, such as the emergence of red faces. One theory for why primates developed sensitivity to red is that it allowed ripe fruit to be distinguished from unripe fruit and inedible vegetation. Bulls, for instance, cannot see the red color of the cape of a bullfighter, but they are agitated by its movement. #China colorful gamer headset quotes fullPrimates can distinguish the full range of the colors of the spectrum visible to humans, but many kinds of mammals, such as dogs and cattle, have dichromacy, which means they can see blues and yellows, but cannot distinguish red and green (both are seen as gray). In the language of optics, red is the color evoked by light that stimulates neither the S or the M (short and medium wavelength) cone cells of the retina, combined with a fading stimulation of the L (long-wavelength) cone cells. It is a primary color in the RGB color model and the light just past this range is called infrared, or below red, and cannot be seen by human eyes, although it can be sensed as heat. The human eye sees red when it looks at light with a wavelength between approximately 625 and 740 nanometers. They charge the matador's cape because of its motion, not its color.
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