Environmentally friendly method for producing lightfast black shades on natural and synthetic substrates
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1994
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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.
