Coal-tar is old-fashioned emotive stuff ... “From a nutritional point of view, the addition of colours is not necessary,” she told just-food.com. She added that the decision by a company ...

The only point he cautions contractors on is for those switching from coal tar to asphalt sealer (or vice versa) during the season. "We recommend that before they put an asphalt-based sealer into ...

These colors, for there are many of them, have been prepared from the alkalies of coal tar by Messr3. W. Perkins and A. H. Church, two rising discoverers, and have been called by them nitroso ...