One of the problems with old buildings is that they need maintaining. Stone buildings have suffered in particular from the acidification of rainfall during the years before smoke free zones and everybody had a coal fire which increased levels of sulphur dioxide in the atmosphere. The sulphur dioxide would dissolve in the moisture in the air producing a dilute solution of sulphurous and sulphuric acids. This had a particularly corrosive effect on limestone leaving it pock marked and eroded. This is St. Thomas church in Lowther street shouded up for repairs to stonework.
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