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The white marble domes and minarets of the Taj Mahal were constructed as a monument to love by the Mughal Emperor Shah Jahan on the death of his favourite wife, nearly four hundred years ago. 

In recent years, pollution from factories and a nearby oil refinery have turned its pristine walls yellow. The Archaeological Survey of India began applying mud-packs to clean the monument in the mid-1990s. 

It says continuing high levels of pollution means the treatment needs to be applied again soon. The lime-rich clay mask is believed to be based on a recipe used by Indian women to restore the natural glow to their faces. 

A thin layer of mud is painted on the marble and left overnight before being brushed off in the morning. The surfaces are then washed down with distilled water to remove polluting chemicals drawn from the stone and the dirt and grease left behind by millions of visitors.