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

Figure 4

SERS spectra (514 nm excitation) obtained from the dried beads after extraction of the red dye from a pre-Columbian textile sample with Ag-agar gel spiked either with ethanol or disodium-EDTA solution ((a) and (b), resp.) or from reference alizarin solutions in ethanol (c). (d) The textile sample is shown with a 25 mm ruler on top; the 5 mm dimension agar gel bead is placed close to the ruler.

(a)

(b)

(c)

(d)