Fig. 6From: Organic colorants based on lac dye and brazilwood as markers for a chronology and geography of medieval scriptoria: a chemometrics approachExcitation and emission spectra of: shellac (processed resin without lac dye chromophores), sticklac (raw material, resin + chromophores), and Al3+-lac complex, pH = 3.5; lac dye reconstructions from recipes in Bolognese 130, Mappae Clavicula and Strasbourg, applied, using glair as a binding medium, on filter paperBack to article page