"We're a coatings manufacturer and we will make coatings out of whatever quality materials are out there that we can get," Conwell says. "If the contractors want a coal tar sealer and we can get ...

Food colourings not actually based on coal tar Coal tar, the black viscous liquid left over when coal is cooked to make coke, became the source for scientific experimentation around 150 years ago ...

The Minnesota Legislature is considering a bill banning the use of coal tar-based products, and the League of Minnesota Cities has advised local governments to develop ordinances prohibiting or ...