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Dyes on Archaeological Textiles: Analyzing Alizarin and Its Degradation Products

Department of Fashion and Industry, University of Incheon, Incheon 402-749, South Korea

S. Kay Obendorf

Department of Textiles and Apparel, Cornell University, Ithaca, NewYork 14853, U.S.A.

This research investigates the degradation products and pathway of alizarin in selected conditions of accelerated aerobic degradation. The degradation study is a step toward dye identification on badly faded textiles of archaeological origin. The four major degradation products identified through GC-MS analysis are benzoic acid 4, 2,4-di-tert butyl phenol 5, phthalic anhydride 6, and dimethyl phthalate 7. Benzoic acid and 2,4-di-tert butyl phenol are the major products formed upon thermal degradation, while phthalic anhydride and dimethyl phthalate exist in thermal and peroxide/UV treated specimens. Among the four degradation prototypes of this study, peroxide/uv radiation results in the most accelerated degradation, producing phthalic anhydride 6 as its main degradation product. A degrada tion pathway is also proposed.

Textile Research Journal, Vol. 74, No. 11, 949-954 (2004)
DOI: 10.1177/004051750407401102


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