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22 December 2010, 15:04
Westminster Council says it's spending ten times as much money on a 'special kind' of grit for roads around the National Gallery.
It's after they discovered last year high levels of salt in normal grit was getting trekked into the gallery, where it could damage the priceless paintings.
The council is now also contacting other galleries in central London, including Tate Britain and The National Portrait Gallery, to warn them of the dangers grit and salt can pose.