Coal-tar colors used in food products
A 1912 government bulletin on coal-tar dyes used to colour food, issued by the United States Bureau of Chemistry of the Department of Agriculture in Washington, D.C., for regulators, chemists and food manufacturers. The picture is the department's seal: a circular emblem with a sheaf of wheat, a plough and a banner reading 'Agriculture and Commerce', ringed by stars and the words 'United States Department of Agriculture', a plain official mark a designer could adapt for government or agricultural identity.
