Bottle (55.1.74): Archaeological objects, like this Roman bottle, often have very fragile surfaces because of weathering, a type of deterioration of the surface of glass caused by burial. The surface can become so deteriorated that it flakes off even with gentle handling, this means that the usual cleaning techniques could be very damaging and can’t be used. Luckily, these objects don’t need to be cleaned often. Read more about Weathered Archaeological Glass.