Non-destructive determination of natural dyestuffs used for ancient coloring cloth by the three-dimensional fluorescence spectrum

Abstract

For the determination of the natural dyestuffs used for an ancient coloring cloth without damage of the cloth, the three-dimensional fluorescence spectrum of each standard sample was measured to draw a contour plot diagram of fluorescence intensity upon the coordinate of the excitation (λEx) vs. emission wavelength (λEm). It was found that the dyestuffs can be identified by the respective top ring of contour line showd by both wavelength as follows: (A) Dyestuff from the plant Rubia cordifolia L. var. Munjista Miq. root, “Akane” in Japan, λEx, 409∼419 nm/λEm 599∼619 nm; (B) from the plant Miscanthus tinctorius Hackel leaf, “Kariyasu”; λEx 442∼466 nm/λEm 522∼538 nm; (C) from the plant Gardenia jasminoides Ellis berry, “Kuchinashi”; λEx 409∼424 nm/λEm 529∼557 nm; (D) from the sea invertebrate Rapana thomasiana hypobranchial gland, “Akanishi”; λEx 335∼352 nm/λEm 432∼441 nm; (E) from the plant Polygonum tinctorium Lour. leaf, “Tadeai”, λEx 354∼370 nm/λEm 404∼416 nm; (F) from the plant Carthamus tinctorius L. petal, “Benibana”; λEx 547∼70 nm/λEm 592∼605 nm. © 1992, The Japan Society for Analytical Chemistry. All rights reserved.