Figure 6 | Scientific Reports

Figure 6

From: Revealing time’s secrets at the National Theatre of Costa Rica via innovative software for cultural heritage research

Figure 6

In low frequency: Raman spectroscopy of the pigments. (a) Comparison of Raman spectra for reference pigments and those of the samples. (b) Orangey–pink crystal from sample M1-54P corresponds to lead red, (c) Green and blue crystals from sample M2-69P correspond to viridian and ultramarine, respectively. (d) Red and yellow crystals from sample M1-45B correspond to vermilion and chrome yellow, respectively.

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