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Maderas. Ciencia y tecnología
versión On-line ISSN 0718-221X
SODERO MARTINS PINCELLI, Ana Lúcia Piedade; DE MOURA, Luiz Fernando y BRITO, José Otávio. Effect of thermal rectification on colors of Eucalyptus Saligna and Pinus caribaea Woods. Maderas, Cienc. tecnol. [online]. 2012, vol.14, n.2, pp.239-248. ISSN 0718-221X. http://dx.doi.org/10.4067/S0718-221X2012000200010.
Eucalyptus saligna and Pinus caribaea var. hondurensis woods underwent a variety of thermal rectification treatments (from 120ºC to 180ºC) to evaluate the effect of heating on their colorimetric properties. The following color parameters were measured: lightness (L), a* coordinate (green-red coordinate), b* coordinate (blue-yellow coordinate), saturation (C), and tonality angle (H). This study demonstrates that thermal rectification can be regarded as a tool for adding value to wood through color modification by heating. Results also suggest that thermal rectification might be a tool for homogenizing wood tonality and reddish color between species. Both tested species have shown very distinct colorimetric behaviors as a function of thermal treatments. The conifer was more resistant to thermal darkening than the hardwood while exposed to temperatures below 160oC. The green-red coordinate (a*) and the tonality angle (H) tended to be homogenized for both species, as they decreased in eucalyptus, and increased in pinus, as a function of heating. The effect of wood heating on the blue-yellow coordinate (b*), saturation (C), and tonality angle (H) was likely to be opposite between both tested species.
Palabras clave : Eucalyptus; pinus; thermal treatment; color.