Matches in DBpedia 2016-04 for { ?s ?p "Black sugar is a form of crystalline precipitate or a particulate pollution by-product unique from creosote caused by the burning of low grade coal in the 1940–1960's. The outgas from burning coal would be a by-product (burning coal was used in residential forced hot air furnaces) for the heating of family housing. Black sugar was often found on porches and the cold ductwork and caused the high carbon, soot-loaded gas to precipitate on the floors and walls and crystallize."@en }
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- Black_sugar comment "Black sugar is a form of crystalline precipitate or a particulate pollution by-product unique from creosote caused by the burning of low grade coal in the 1940–1960's. The outgas from burning coal would be a by-product (burning coal was used in residential forced hot air furnaces) for the heating of family housing. Black sugar was often found on porches and the cold ductwork and caused the high carbon, soot-loaded gas to precipitate on the floors and walls and crystallize.".