抄録
The dye components, Fast Orange GC, Red B, Red RL, Bordeaux GP and Scarlet G, and the other components, Naphthol AS and β-Naphthol, were purified. By combinations between these components colors were developed in the cellophane and PVA sheets. The changes of visible absorption spectra of the dyes in the films obtained after steaming, soaping and boiling in water, respectively, were compared with those of before the treatments. The Naphthol AS dyes revealed following spectral changes through the above treatments:
(a) the maxima of the absorption bands of Orange GC, Bordeaux GP and Scarlet G showed no change, (b) those of Red RL shifted to the long wave length side, (c) those of Red B to the short side. In all cases, the optical densities increased by the treatments. The shape of the absorption curves after the treatments were restored to their original ones, when the dyes are dry heated at about the melting points of the dyes, i.e. 250_??_300°C.
These spectral changes by the wet or dry heating may be due to aggregation or dispersion of the color lakes in the films.
