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Heritage Science

Table 1 Computed TD-DFT transitions of indigo in chloroform and experimental data of indigo in solvent, hybrid palygorskite-based Maya blue (Paly-MB) and sepiolite-based Maya blue (Sep-MB)

From: Shades of blue: non-invasive spectroscopic investigations of Maya blue pigments. From laboratory mock-ups to Mesoamerican codices

 

Theoretical

Experimental

Chloroform

Paly-MB

Sep-MB

λmax/nm (eV)

Composition

λmax/nm (eV)

λmax/nm (eV)

λmax/nm (eV)

Visible band

605 (2.05)

H → L (75%)

603 (2.06)

661 (1.88)

642 (1.93)

UV band

279 (4.45)

H − 1 → L + 1 (87%)

286 (4.34)

293 (4.23)

290 (4.28)

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