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Figure 6 | Heritage Science

Figure 6

From: Winsor & Newton original handbooks: a surface-enhanced Raman scattering (SERS) and Raman spectral database of dyes from modern watercolor pigments

Figure 6

SERS analysis of madder lake-based pigments. (a) SERS spectrum of reference madder lake upon HF treatment compared to examples of SERS spectra obtained from Winsor & Newton madder lake-based pigments (λexc = 488 nm): (b) rose madder 20th century edition, (c) rose madder 19th century edition, (d) Rubens’ madder 20th century edition, (e) Rubens’ madder 19th century edition, and (f) warm sepia 20th century edition.

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