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3. Stability and Sensory Evaluation of Naphthoquinone Pigments from the Roots of Lithospermum erythrorhizon;Chung;Korean J Food Sci and Technol,1994
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5. Code of federal regulation (2019). Code of federal regulations title 21-Food and drugs. Chapter I. Subchapter A-general-part 74: Listing of color additives subject to certification.