| http://www.w3.org/ns/prov#value | - Hank Roberts Oct 17, 2011 Did you know the hard glassy slag from coal furnaces is now considered safe to use as abrasive for ???sandblasting??? operations, despite the fact that once it???s used it???s powdered and the arsenic and beryllium and other toxic metals are released, so the stuff becomes toxic waste and contaminates areas where it???s used?
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