Understanding Coal Tar dyes in Food: Facts and Controversies Food colouring and other additives derived from coal tar have come in for some bad press recently. Hugh Westbrook delves into the ...

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 ...

THE numerous products obtained from coal-tar are ever increasing in importance, not so much, perhaps, because of the isolation of new substances or new derivatives of the older materials ...