EFFECT OF THERMAL RECTIFICATION ON COLORS OF EUCALYPTUS SALIGNA AND PINUS CARIBAEA WOODS

Ana Lúcia Piedade Sodero Martins Pincelli, Luiz Fernando de Moura, José Otávio Brito

Abstract


Eucalyptus saligna and Pinus caribaea var. hondurensis woods underwent a variety of thermal
recti cation treatments (from 120ºC to 180ºC) to evaluate the e ect of heating on their colorimetric
properties. e following color parameters were measured: lightness (L), a* coordinate (green-red
coordinate), b* coordinate (blue-yellow coordinate), saturation (C), and tonality angle (H). is
study demonstrates that thermal recti cation can be regarded as a tool for adding value to wood
through color modi cation by heating. Results also suggest that thermal recti cation 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. e conifer was
more resistant to thermal darkening than the hardwood while exposed to temperatures below 160oC.
e 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. e e ect of wood
heating on the blue-yellow coordinate (b*), saturation (C), and tonality angle (H) was likely to be
opposite between both tested species.

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