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Green is the color between blue and yellow on the visible spectrum. It is evoked by light which has a dominant wavelength of roughly 495–570 nm. In subtractive color systems, used in painting and color printing, it is created by a combination of yellow and blue, or yellow and cyan; in the RGB color model, used on television and computer screens, it is one of the additive primary colors, along with red and blue, which are mixed in different combinations to create all other colors. By far the largest contributor to green in nature is chlorophyll, the chemical by which plants photosynthesize and convert sunlight into chemical energy. Many creatures have adapted to their green environments by taking on a green hue themselves as camouflage. Several minerals have a green color, including the emerald, which is colored green by its chromium content.

During post-classical and early modern Europe, green was the color commonly associated with wealth, merchants, bankers and the gentry, while red was reserved for the nobility. For this reason, the costume of the Mona Lisa by Leonardo da Vinci and the benches in the British House of Commons are green while those in the House of Lords are red. It also has a long historical tradition as the color of Ireland and of Gaelic culture. It is the historic color of Islam, representing the lush vegetation of Paradise. It was the color of the banner of Muhammad, and is found in the flags of nearly all Islamic countries.

In surveys made in American, European, and Islamic countries, green is the color most commonly associated with nature, life, health, youth, spring, hope, and envy. In the European Union and the United States, green is also sometimes associated with toxicity and poor health, but in China and most of Asia, its associations are very positive, as the symbol of fertility and happiness. Because of its association with nature, it is the color of the environmental movement. Political groups advocating environmental protection and social justice describe themselves as part of the Green movement, some naming themselves Green parties. This has led to similar campaigns in advertising, as companies have sold green, or environmentally friendly, products. Green is also the traditional color of safety and permission; a green light means go ahead, a green card permits permanent residence in the United States.

Green Media

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Green jasper ring stone

Green jasper ring stone

Running bull. Hellenistic

Green bead with applied mosaic strips
Scarab
Rods of Green Glass

Rods of Green Glass

From Egypt, Memphite Region, Lisht North, Cemetery, MMA excavations New Kingdom, Ramesside

Mask
Scarab
Rod of Opaque Green Glass

Rod of Opaque Green Glass

From Egypt, Upper Egypt, Thebes, Malqata, Palace of Amenhotep III, factories, MMA excavations, 1911–12 New Kingdom

Ring with Green Stone in Circular Setting
Ear Clip with Green Translucent Stone
Pair of Ear Ornaments with Green Stones
Ring with Inset Circular Green Stone
Ring with Green Stone in Circular Mount
Necklace with a Green Glass Bead

Necklace with a Green Glass Bead

Central Javanese period

Green Tile with Star Design

Green Tile with Star Design

Attributed to Afghanistan

Green Tara, Leaf from a dispersed Ashtasahasrika Prajnaparamita (Perfection of Wisdom) Manuscript

Green Tara, Leaf from a dispersed Ashtasahasrika Prajnaparamita (Perfe...

Green Tara, seated on a cushioned throne, her hand raised offering protection (abhaya mudra) Pala period

Pitcher