Fig. 12

FTIR-2D imaging of the black Golden MSA paint mock-up, showing areas cleaned with Shin-Etsu KSG-350z (a, b) and Velvesil Plus (c, d) applied with a soft brush and cleared with dry and D5-dipped swabs (exposure time: 1 min); with control soiled (e, f) and unsoiled areas (g, h). For each area, the images besides the visible map show the corresponding 2D FTIR maps, where the intensity of the negative band at 1260 cm⁻¹ (silicon-methyl stretching) was imaged. All maps are 700 × 700 µm². The corresponding FTIR spectra are shown in the right panel; each spectrum relates to a single pixel (5 × 5 µm²) of the corresponding 2D imaging map. The asterisked band corresponds to silicone emulsifer residue at 1260 cm⁻¹