The dominant wavelengths corresponding to hue of tyrosine, tryptphane and their mixed solutions by exposing to light were 576±0.5mμ respectively. Judging on their results from the measuring exactitude, it was therefore difficult to elucidate whether the yellowing of silk by exposing to light is mainly caused by tyrosine or tryptphane, due to the difference in their dominant wavelength. If the values below 1mμ on these results have any meaning, the dominant wavelength of the yellowing silk exposed to light becomes just in the middle of these of tyrosine and tryptphane.
Next, as for the coloring of the solution mixed with tyrosine and tryptphane by exposing to light, it is recognized that there exists a remarkable sensitization between them. And the coloring concentration of the solution mixed with tyrosine and tryptphane exposed to light is twice as large as the sum of each in the case of exposing independently.
The authors moreover obtained the following formulae with regard to the function present between the percentage transmittance
T (%) of monochromatic light or luminosity
Y (%) of transmitting light, and the time of exposure
t (hr).
And then the value of each constant
k in these formulae changes with changed spectral wavelength, that is, from 10 (400mμ) to 15 (600mμ). These constants mean that the coloring of their mixed solutions make scarcely their appearance till
k (hr) of exposure time is elasped.
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