Fig. 3From: Chromatographic analysis of natural dyes in mediaeval Islamic paperUV–vis spectra associated with henna, recorded during HPLC–DAD analysis of: a sample AS7 (retention time: 16.7 min); b sample AS1 (retention time: 16.7 min); c sample AS8 (retention time: 16.6 min); d sample AP45-1–2 (retention time: 14.5 min)Back to article page