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Popular Science, April 1940: "A color advertisement that smelled, but smelled beautifully, was printed recently in an Indianapolis, Ind., newspaper to promote the sale of a new perfume. To accomplish this novel feat, green printer’s ink was scented by adding concentrated perfume oil, and applied to the page on which the advertisement appeared by means of a special 'ink fountain' of the type used to print a color on a single page of a large newspaper. The unit, pictured below, can be attached quickly to the press."
-- Modern Mechanix
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