12 traditional and 24 modern colour wheel. In process pigments colour wheel are primary hues yellow, cyan, magenta. Magenta + yellow = red, magenta + cyan = blue, cyan + yellow = green. This is subtractive model of mixing pigments. In RGB system of lights is red, green, blue primary (additive color mixing).
"Cromointerferencia de color aditivo, 1974-1978" (Detail), por Carlos Cruz Diez. Aeropuerto Internacional Simón Bolívar (Maiquetía, Venezuela). / "Cromointerference of Additive Color, 1974-1978" (Detail), by Carlos Cruz-Diez. Simon Bolívar International Airport (Maiquetía, Venezuela)
The autochrome plate was the first three-color photography process on the market and belongs to the group of additive color processes. The medium consists of a mosaic of colors on a glass plate, designed to be viewed using hand-held devices or projected using carbon arc lamps. | eBay!