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Enticed by the brilliant green hues of copper acetate and copper resinate, some painters in the Renaissance period incorporated these pigments into their masterpieces. However, by the 18th century, most artists had abandoned the colors because of their tendency to darken with time. Now, researcher jordans damen s reporting in ACS鈥?journal Inorganic Chemistry have uncovered the chemistry behind the copper pigments鈥?color change.Copper acetate (also known as verdigris) and copper resinate were used in European easel paintings between the 15th and 17th cent jordan 1 mid uries. Artists typically mixed these pigments with linseed oil to make paint. Until now, scientists didn鈥檛 know why the green paints often turned brown with time, although they had some clues. Light exposure was thought to play a rol nike dunk nike e because areas of paintings protected by frames remained green. Also, oxygen appeared to contribute to the darkening process, with the brown color spreading from cracks in the paint that exposed the underlying copper pigm BEIJING:China's Communist-controlled legislature passed a law imposing new regulations on foreign non-government organisations on Thursday, authorities said.The measure has provoked an outcry from charities and concerns from foreign governments that it gives police wide-ranging discretionary powers amid a crackdown on civil society in the country.At least 1,000 foreign NGOs are thought to operate in China, including development charities such as Save the Children, advo stanley cacy groups including Greenpeace, chambers of commerce and university centres.China mulls tighter control of foreign charities: reportThe National People's Congress standing committee, which acts as the parliament when the NPC is not in full session, gave the law almost unanimous approval, with 147 votes in fa newbalance vour and only one against.The full text was not immediately available, but a draft of the bill descr adidas campus damen ibed by the official Xinhua news agency in a report earlier this week carried many provisions which previously trigg
Enticed by the brilliant green hues of copper acetate and copper resinate, some painters in the Renaissance period incorporated these pigments into their masterpieces. However, by the 18th century, most artists had abandoned the colors because of their tendency to darken with time. Now, researcher jordans damen s reporting in ACS鈥?journal Inorganic Chemistry have uncovered the chemistry behind the copper pigments鈥?color change.Copper acetate (also known as verdigris) and copper resinate were used in European easel paintings between the 15th and 17th cent jordan 1 mid uries. Artists typically mixed these pigments with linseed oil to make paint. Until now, scientists didn鈥檛 know why the green paints often turned brown with time, although they had some clues. Light exposure was thought to play a rol nike dunk nike e because areas of paintings protected by frames remained green. Also, oxygen appeared to contribute to the darkening process, with the brown color spreading from cracks in the paint that exposed the underlying copper pigm BEIJING:China's Communist-controlled legislature passed a law imposing new regulations on foreign non-government organisations on Thursday, authorities said.The measure has provoked an outcry from charities and concerns from foreign governments that it gives police wide-ranging discretionary powers amid a crackdown on civil society in the country.At least 1,000 foreign NGOs are thought to operate in China, including development charities such as Save the Children, advo stanley cacy groups including Greenpeace, chambers of commerce and university centres.China mulls tighter control of foreign charities: reportThe National People's Congress standing committee, which acts as the parliament when the NPC is not in full session, gave the law almost unanimous approval, with 147 votes in fa newbalance vour and only one against.The full text was not immediately available, but a draft of the bill descr adidas campus damen ibed by the official Xinhua news agency in a report earlier this week carried many provisions which previously trigg