Red is the color at the end of the visible spectrum of light, next to orange and opposite violet. It has a dominant wavelength of approximately 625–740 nanometres. It is a primary color in the RGB color model and the CMYK color model, and is the complementary color of cyan. Reds range from the brilliant yellow-tinged scarlet and vermillion to bluish-red crimson, and vary in shade from the pale red pink to the dark red burgundy. The red sky at sunset results from Rayleigh scattering, while the red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide. Iron oxide also gives the red color to the planet Mars. The red color of blood comes from protein hemoglobin, while ripe strawberries, red apples and reddish autumn leaves are colored by anthocyanins.
Red! (Dutch: Rood! or ROOD!) is a Flemish socialist political party in Belgium. It was founded in 2011 after some members of SP.A, led by Erik De Bruyn, left the Flemish social-democratic party. Red! Supports a social democratic welfare state, and opposes Neoliberalism and the Third Way policies endorsed by the SP.A. The party currently has no parliamentary representatives.