Читать книгу Monument Future - Siegfried Siegesmund - Страница 373

After oven-drying at 70 °C to a constant weight, 15 colour measurements were taken in each sample, and the mean for each sample were calculated. Afterwards each sample was submerged in water for an hour and 20 colour measurements were taken again in the wet samples. The colour was assessed with an X-Rite colorimeter (model 964), with 45°/0° geometry and specular component included, D65 illuminant and 8 mm aperture. Colour was expressed using the three chromatic coordinates of CIE-L*a*b* system. The colour difference (ΔE*) between the dry and wet state was calculated for each sample.