Fig. 9

Brazilwood paints, excitation and emission spectra representative for BW 1 group, Ajuda Songbook f. 59); BW 2 group, IL 42 f. 113; BW 3 group, ms 24 f. 60; and brazilein 5 × 10^–5 M in MeOH:H₂O (70:30, v/v) with Al³⁺ (× 1000) at pH 3.2, applied on filter paper