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were very different. 
Film #6120 had larger mean color difference than film 
#2447, and seemed visually to be the same as film $2448, 
Table 4 shows reproduction of the color paper. 
Generally, mean color difference of the color paper were larger 
than that of the color film. 
4-3 MTF 
The resolution chart on the duplicated images was scanned 
by the microphotometer through the red, green and blue filter 
and MTF's for sinusoidal wave of each three layer were derived 
as shown in Fig. 21. 
For every color duplications MTF's of each layer decreased 
in order of the emulsion layer arranged. 
MTF of the blue sensitive yellow layer, which was on the top 
of the three layers, gave the highest status, then the magenta 
and the cyan layer, followed it. 
In order to compare all color duplications, the spatial 
frequency where the response was equal to 70 $ was used as an 
index. As shown in Table 5, decrease of MTF by duplication 
was relatively small, even if two or more duplicating process 
were used. 
This is probably because the response of 70$ was enhanced 
by the adjacent effects of the duplication film. 
MTF of all color duplications decreased to one half of the 
original color film. 
5 DURABILITY TEST 
5-1] Procedures 
Following three methóds were adopted to a durability test. 
13 Exposure test by natural day-light 
Test samples were put on the window glass faced on the 
south by contacting their emulsion side on the glass plate and 
were exposed to the sun light for 30 days. This test was 
carried out in March 1977, and weather of this test period were 
as follows: 14 days of very clear, 8 days of fine, 4 days of 
cloudy, 3 days of rainy and one snowy day. 
In Japan, a solar intensity in this season is not so strong as 
Summer, 
2) Exposure test by incandescent tungsten lamp 
Test samples on the black background were exposed to four 
flad lamps; rated value 100V 500W,