Pollution Turns China's Yellow River Red For Second Time In 30 Days - BBC

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A stretch of China's Yellow River turned red for the second time in a month because of pollution, media says.
Waste water from a heating station near the city of Lanzhou contaminated 1km of the river, the country's second longest, according to Xinhua. A similar spill occurred in the same area at the end of October.

China has some of the world's most polluted rivers, and is accused of overlooking the protection of the environment to develop its economy.

Local environmental officials said the red plume of water "very possibly" came from a station that provides heating for Lanzhou residents. The plant had added a red dye to its water to prevent people from siphoning off the hot water from the pipes it used, officials were quoted by Chinese media as saying.

Tests found the dye was not toxic, and the spill lasted for around an hour, Xinhua news agency reports.

EDIT

http://news.bbc.co.uk/2/hi/asia-pacific/6172360.stm