摘要：Fabric test pieces of cotton and silk dyed by purpurin, the principal component of Akane which is one of traditional Japanese dyestuffs, were exposed to NO2 gas in a glass chamber. Decrease in the tenacity of cotton thread and the elogation of silk thread was observed to occur, while the elogation of cotton thread showed a trend with a maximum value. Examination of dose-response characteristics between NO2 gas exposure and Δ E, color change of the fabrics, led to the following conclusions: NO2 exposure causes greater color fading of cotton than silk, and the degree of fading is enhanced by the humidity in both cases. This effect should not be ignored even in the human environment over a long period of time.
