The Fading Rate of Magenta Pyrazolone Azomethine Dye for Visible Light

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  • マゼンタ・ピラゾロン・アゾメチン色素の可視光による退色速度
  • マゼンタ ピラゾロン アゾメチン シキソ ノ カシコウ ニ ヨル タイショク ソクド

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The light fading rate of magenta dye, 4-aza-(p-diethyl-aminophenyl)-pheny1-3-methyl-pyrazole-5-one, was studied. The dye was prepared by the method of coupling development, and extracted from the reaction product. Then, it was dispersed into a cellulose acetate film.<BR>According with spectral fading of the dye, absorptions of 270 nm and 540 nm contributed to the fading reaction each other, but 440 nm did not.<BR>The kinetic expression of fading rate for 540 nm light was as follows.<BR>-dC/dt= (K/C0)ΔI·C<BR>K: rate constant Co: initial concentration of the dye<BR>I: absorbed light C: concentration of the dye

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