It's quite hard to see because the lighting conditions of the Taj Mahal make it look a different colour at different times of day,
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which isn't helped by Indian "journalists" doing shitty photoshop jobs. What is easy to see is where it's turning GREEN:
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This is caused by droppings from Chironomus (a type of midge). They don't normally swarm in such large numbers where this is a problem, but they do really well in phosphorous rich polluted water and, well
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The green stains can be washed off with water, but as the locals are concerned washing the marble too much might make it lose its sheen they're covering it in mud masks that Indian women traditionally use for skincare, to help "unclog the marble's pores".
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While I can't say for certain, the fact that this mud mask is some sort of traditional beauty treatment makes me strongly suspect there's cow dung involved. The Mughals were a highly advanced civilisation that
in some ways were viewed as equals by the British (unlike the Hindus). I wonder what they'd make of one of their greatest achievements falling into this state today, with locals smearing shit all over the walls? Oh also, apparently the Hindu nationalists have completely removed references to the Mughals entirely from the national curriculum.