Fig. 2 shows the spectral reflectance curves obtained for coloring inpink with Rhodamine B. The reflectance values indicate the proportionof visible spectral range (400 to 700 nm) reflected by the analyzed samples. Pink does not occupy a niche in the visible spectrum but is a lesssaturated version of red mixed with other colors, like violet. Therefore,reflectance peaks occur at the two extremes of the spectrum, especiallyin the red wavelength (Maloney, 1999). As can be seen, except for theglazed agate type, the samples demonstrated a significant alteration inthe reflectance bands after dyeing and polishing. Some agate classes, notably the flocked and massive ones, acquired purple tones when dyed athigh dye concentrations (C4 and C5) either in warm and cold dyeing, asrevealed by the visual aspect of the pieces (Fig. 3) and by the reflectancepeaks at the violet wavelength range (400–450 nm) after polishing. Theflocked agate type showed quite good dye acceptance in all cases, withreflectance values of about 25% within the red band (610–700 nm) and I always like it when/see christmas trees.
การแปล กรุณารอสักครู่..
