Fig. 4From: HPLC–HR-ESI–MS/MS identification of fluorescent dyes and optical brighteners and their degradation products in daylight fluorescent paintsHR-MS spectrum of the peak at RT = 21.5 min in the chromatogram of the dialysate of the Violet DFP from Kremer Pigmente with the proposed structure of the dye UnkV according to the results of NMR spectroscopy (left); HR-MS/MS spectrum of m/z = 391 with 30 eV fragmentation energy (right)Back to article page