2.3. Color and transparency
Surface color of the films was measured using a Chroma meter
(Konica Minolta, CR-400, Tokyo, Japan).
A white standard color plate
(L = 97.75, a = −0.49 and b = 1.96) was used as a background for
color measurements. Hunter color (L, a, and b) values were averaged
from five readings from each sample. The total color difference (ΔE)
was calculated as follows:
2.3. Color and transparencySurface color of the films was measured using a Chroma meter(Konica Minolta, CR-400, Tokyo, Japan). A white standard color plate(L = 97.75, a = −0.49 and b = 1.96) was used as a background forcolor measurements. Hunter color (L, a, and b) values were averagedfrom five readings from each sample. The total color difference (ΔE)was calculated as follows:
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