 The late 19th century carvings of Roman Emperors and Governors of Roman Britain on the terrace overlooking the Great Bath are particularly susceptible to the effect of acid rain and are being protected with a wash of a sacrificial shelter coat every few years. Exhibits within the temple precincts are susceptible to warm air which had the effect of drawing corrosive salts out of the Roman stonework. To help reduce this, a new ventilation system was installed in 2006.
