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The Ozone Fading of Traditional Chinese Plant Dyes

Ye, Yun and Salmon, Lynn G. and Cass, Glen R. (2000) The Ozone Fading of Traditional Chinese Plant Dyes. Journal of the American Institute for Conservation, 39 (2). pp. 245-257. ISSN 0197-1360. doi:10.1179/019713600806082685.

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Silk samples dyed with 12 traditional Chinese plant dyes were examined to measure their rate of fading upon exposure to atmospheric ozone. Samples of the same colorants extracted directly from the dried plant materials and applied to watercolor paper also were tested for their sensitivity to ozone-induced fading. The samples were exposed in a chamber to an atmosphere containing 0.40 parts per million ozone at 25°C ± 1°C and 50% RH, in the absence of light, for 22 weeks. Colorant-on-paper samples produced from the dyes Jiang huang (turmeric), zi cao (gromwell), and zi ding cao (violet) proved to be particularly reactive toward ozone and faded by ∆E>10 over the course of the experiment. Ju zi pi (tangerine peel extract) on paper changed color by ∆E>5, with an increase in reflectance below a wavelength of 530 nm and a decrease above 530 nm. All but one of the remaining colorant samples on paper changed by ∆E>2 as a result of ozone exposure. Color changes observed among the dyed silk samples generally were smaller than for the colorant-on-paper systems, due to their darker initial depth of shade and hence higher colorant concentration per sample, to their greater saturation of colorant throughout the cloth, and to the effects of mordanting. Colorant-on-silk samples showing color changes of ∆E>2 over the course of the experiment include zi cao (gromwell), su mu (sappan wood), huang zhi zi (gardenia), Jiang huang (turmeric), and zi ding cao (violet).

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Additional Information:© 1999 Taylor & Francis. Received for review May 17, 1999. Revised manuscript received December 1, 1999. Accepted for publication March 14, 2000. The silk and dried plant material samples used in this research were made available with the cooperation of Ms. Qian Xiaoping, Suzhou Silk Museum, Suzhou, China.
Group:Environmental Quality Laboratory
Issue or Number:2
Record Number:CaltechAUTHORS:20160722-120146397
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69167
Deposited By: Ruth Sustaita
Deposited On:25 Jul 2016 21:13
Last Modified:11 Nov 2021 04:10

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