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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592


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Title: Infrared and colorimetric characterization of discolored kiln-dried hard maple lumber

Source: Forest Prod. J. 54(1):53-57.

Author(s)Dawson-Andoh, Wiemann, Matuana, Baumgras

Publication Year: 2004  View PDF »

Category: Journal Articles

Abstract: Discoloration of hard maple lumber commonly occurs during kiln-drying. In this study, discolored and nondiscolored kiln-dried hard maple lumber boards were characterizedusing a colorimetric method and Attenuated Total Reflectance-Fourier Trans. form Infrared Spectroscopy (ATR-FTIR). Colorimetric measurements (L*, a*, b*) were found to be in good agreement with visual grading. Brightness or lightness (L*) of hard maple lumber decreased with discoloration while redness (a*) and yellowness (b*) increased with discoloration. The pH and metal ion content of lumber appeared to play no role inthe discolorationprocess. ATR-FTIR spectra of lumber revealed that althoughall lumber boards exhibited similar features inthe fingerprint and other regions, there were differences in intensities of some absorption bands One significant difference between accepted and rejected lumber boards was in the 1600-1717 cm-1 region. ATR-FTIR alone was not sensitive enough to adequately describe changes in chemistry of discolored and discolored hard maple lumber boards.

File size: 147 kb(s)

Date posted: 04/05/2010
Current FPL Scientist associated with this product
Wiemann, Michael C.

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