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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.
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Kolkata ( or , Bengali: [ˈkolˌkata] (listen), also rendered Calcutta , the official name until 2001) is the capital of the Indian state of West Bengal. Located on the eastern bank of the Hooghly River, the city is approximately 80 kilometres (50 mi) west of the border with Bangladesh. It is the prime business, commercial, and financial hub of eastern India and the main port of communication for the North-East Indian states, as well as having the third-largest urban economy of India. According to the 2011 Indian census, Kolkata is the seventh-most populous city in India, with a population of 4.5 million residents within the city limits, and a population of over 14.1 million residents in the Kolkata Metropolitan Area, making it the third-most populous metropolitan area in India. The Port of Kolkata is India's oldest operating port and its sole major riverine port. Kolkata is known as the "cultural capital of India" for the city's historical and architectural significance.In the late 17th century, the three villages that predated Calcutta were ruled by the Nawab of Bengal under Mughal suzerainty. After the Nawab granted the East India Company a trading licence in 1690, the area was developed by the Company into an increasingly fortified trading post. Nawab Siraj ud-Daulah occupied Calcutta in 1756, and the East India Company retook it the following year. In 1793 the East India company was strong enough to abolish rule, and assumed full sovereignty of the region. Under the company rule and later under the British Raj, Calcutta served as the capital of British-held territories in India until 1911, when its perceived geographical disadvantages, combined with growing nationalism in Bengal, led to a shift of the capital to New Delhi.
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