Review Article

Microanalysis of Organic Pigments in Ancient Textiles by Surface-Enhanced Raman Scattering on Agar Gel Matrices

Figure 5

SERS spectrum (514 nm excitation) of Tyrian purple extracted from a cotton fiber mockup by using an agar gel bead containing the leuco-reduction chemicals (a) and Raman spectrum indigo crystals (b).
(a)
(b)