Sandstone sculpture weathered by air and acid rain

Religious medieval sculpture, degraded by the acidification (of air and rains) due to the pollution of the XIXth and XXth century induced by the generalization of fossil fuels, then by the automobile pollution and certain fertilizers, and blackened by the black of carbon . This sculpture is located in Dresden, at the corner of Bautzner Straße and Eck Glacisstraße.