It was fascinating to hear that the British Museum is missing its visitors in more ways than one. It seems that the exhalations of the 17,000 visitors that the museum received daily prior to lock-down were essential for keeping precious exhibits at the correct humidity levels. The museum has not been closed for more than three days at a time (over Christmas) since World War II. Since the closure in March the relative humidity levels have fallen dangerously below 40%, which means that objects made from wood and bone have been drying out and are prone to cracking and fracture. Museum staff have been monitoring the situation closely and moving the most sensitive objects to their environmentally controlled strongrooms. The re-opening of the museum is eagerly awaited by all!
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