Shang-Tzen Chang, Sen-Sung Cheng
Effects of Environmental Factors on the Color of Sugi (Cryptomeria japonica D. Don) Yellowish Heartwood
Summary
The heartwood of sugi (Cryptomeria japonica D. Don), one of the most important planted trees in Taiwan,
has a pleasant yellow, yellowish red to red color. Unfortunately, its attractive appearance is susceptible
to discoloration after environmental exposure. This degradation is a significant defect that
decreases the value of sugi products. The objective of the present study was to evaluate the effects of
environmental factors on the color of sugi yellowish heartwood. We found that the color eventually
turned to brownish black in the presence of moisture. Under the combined influence of light and oxygen
the color of heartwood changed from yellow to reddish blue. The effect of light wavelengths on the
discoloration of sugi yellowish heartwood was also investigated. After irradiation with light of wavelengths
above 600 nm, the color of sugi yellowish heartwood changed significantly from yellowish to
red. Our findings show that red color enhancement, and hence the economic value of sugi yellowish
heartwood, can be achieved by irradiating with light of wavelengths above 600 nm.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 55, 09/2001
Pages: 459 - 463
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