Fig. 2 Safflower extraction process. Clockwise from top left: a rinsing safflower to remove yellow colorant b until clear; c vacuum filtration of safflower soaked in deionized water adjusted to pH 11 with ammonium hydroxide; d adjusting the pH of the filtered extracted with acetic acid; e abso...
Analyses were carried out using a Hewlett-Packard (now Agilent) HPLC HP1100 system comprising a vacuum solvent degasser, a binary pump, autosampler and column oven. The column used for the separation was a Luna C18(2) 100 Å, 150 × 2.0 mm, 3 μm particle size (Phenomenex) stabilized ...
the cross-section revealed a build-up of five layers, indicated with numbers 1-5 in Fig.4c. The first two layers (Fig.4c 1–2) comprise the double ground discussed in the previous section. A green colored underpainting is visible
Analyses were performed with a FE-SEM Zeiss Σigma HD, equipped with an Oxford Instrument X-MaxN80 SDD detector. Backscattered electron (BSE) images, energy-dispersive spectrometry (EDS) analysis, and X-ray mapping were carried out with an accelerating voltage of 20 kV in high vacuum. Raman ...
Analyses were performed with a FE-SEM Zeiss Σigma HD, equipped with an Oxford Instrument X-MaxN80 SDD detector. Backscattered electron (BSE) images, energy-dispersive spectrometry (EDS) analysis, and X-ray mapping were carried out with an accelerating voltage of 20 kV in high vacuum. ...
Aluminium was not detected by XRF in situ on khipu areas, while the analysis in vacuum carried out on thread samples allowed its detection. The accumulated spectra of all the threads exhibit the peak for aluminium; however, no differences in intensities between the undyed and dyed threads were ...