Print advertisement for Dowflake features an illustration of a country dirt road winding through a town with an inset of two men riding in a horse-drawn carriage. The paragraph below the illustration discusses the modern automobile's need for a "smooth, firm, dustless surface," which Dowflake provides, unlike its horse and buggy predecessor. Patented on February 17, 1925, Dowflake was marketed for use to control dust on unpaved roads and parking lots, as well as a roadway deicer. This ad appeared on page 193 of Fortune magazine, dated 1937.
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Dow Chemical Company. “Recipe for Dustless Roads,” 1937. Advertisements from the Dow Chemical Historical Collection, Box 7. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1831ck78b.
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