The samples showed a decreasing trend in L value (brightness) with increasing aging, a general decrease in b value, and a gradual increase in both ΔL and ΔE, indicating that the effect of light on the samples at the macroscopic color caused by the aging time is obvious with increasing aging time.
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Investigation of photoinduced deterioration in shadow puppet artifacts collected from the National Shadow Pupperty Museum in Chengdu, China.
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