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Scientists Dr Elise Morero and Dr Ruggero Longo want to find out more about the red porphyry, so they are travelling to Monreale, where the city’s cathedral is home to a sarcophagus that was carved from this rare material. Which tools were used to work the stone? Where did the material originally come from? The archaeologist and art historian are hoping for answers, which they are also searching for in the storeroom of this UNESCO World Heritage Site.