Limestone window in an ancient building in Rennes, The etched rock is the result of acid rain from the "age of coal", thankfully those days are over . the stone would have looked black in the bad old days, not quite what the architect had planned.
Sunday 3 June 2012
Corrosion...
Limestone window in an ancient building in Rennes, The etched rock is the result of acid rain from the "age of coal", thankfully those days are over . the stone would have looked black in the bad old days, not quite what the architect had planned.
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