found: The Ault & Wiborg Co. process chart, between 1900 and 1915?:cover (Ault & Wiborg Co.) plates (The Ault & Wiborg Co. makers of fine printing ink, Cincinnati, New, Seventh and Culvert Streets.; other offices in New York, Chicago, St. Louis, Buffalo, Philadelphia, Minneapolis, San Francisco, Toronto, Havana, Mexico City, Buenos Aires, Paris and London)
found: Ault & Wiborg Co., Cincinnati, Ohio page on the colorants.history.org site, December 17, 2013:(the Ault & Wiborg Company, manufacturer of printing inks, dry color dyes and pigments, established 1878 in Cincinnati, Ohio by Levi Addison Ault; usage on samples from ca. 1890-1920 indicates both Ault & Wiborg Co. and Ault & Wiborg Company usage)