Eighteen soap samples, each colored with a different dye combination manufactured by the National Aniline and Chemical Company. Includes a description of the soap's composition and the method of dying. 
         
          
      
         National Aniline and Chemical Company. Colorants Pour Savon. New York, New York, n.d. https://digital.sciencehistory.org/works/73x6up6.
      
      
        
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