Environmentally friendly method for producing lightfast black shades on natural and synthetic substrates

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Title: Environmentally friendly method for producing lightfast black shades on natural and synthetic substrates
Date: 1994
Citation: Freeman, H. S., Reife, A., & Sokalawska-Gajda, J. (1994). Environmentally friendly method for producing lightfast black shades on natural and synthetic substrates. U.S. Patent No. 5,376,151. Washington, DC: U.S. Patent and Trademark Office.
URI: http://www.lib.ncsu.edu/resolver/1840.2/1193


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