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Heritage Science

Table 2 Excitation, emission maxima (λmax/nm), and shoulders (sh) present in the analyzed samples

From: Early modern knitted caps (fifteenth to sixteenth centuries): analyzing dyes in archaeological samples using microspectrofluorimetry complemented by HPLC–MS

  1. References of Al3+ complexes of purpurin (magenta) and carminic acid aluminum (red), and data acquired from Andean textiles (dated from 200 BCE to the fifteenth century CE, in grey). An attribution of the dye source is proposed for the samples
  2. aPurpurin 10–4 M in methanol:water(70:30, v/v) with Al3+ (× 100) at pH 2.4
  3. bCarminic acid 10–4 M in methanol:water (70:30, v/v) with Al3+ (× 100) at pH 3.5
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