An encyclopedia article on colour and colour-making in calico printing, from Rees's Cyclopedia. It sorts printers' colours into three classes: dyed colours raised on mordants, chemical colours with mordant mixed into the colouring matter, and colours held in solution by an acid or alkali. It gives recipes and chemical theory for iron and alumina mordants (iron liquor, red liquor), chemical black, berry-yellow, greens and tin solutions for scarlets. The final page appears to carry a separate passage on colour changes from chemical mixtures.