Ancient Monuments: Does It Remain Black? How to Renovate the Porta Nigra

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The Roman city gate is known around the globe. Now it will be made fresh for the next decades. What lasers have to do with it.

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TRIER – It is a historic cleaning operation: the Porta Nigra is being cleaned. For decades, pollution from the environment has been deposited on the once Roman city gate. And these crusts must be removed in order to protect the world-famous building from further damage. "We reduce the dirt crusts in order to give the stones the opportunity to breathe again", [...]