COLORIMETRIC CHARACTERISATION OF TROPICAL WOODS

• DOI: 10.37572/EdArt_3011230553

• Palavras-chave: Tropical wood, colour, CIELab system, heartwood, sapwood

• Keywords: Tropical wood, colour, CIELab system, heartwood, sapwood

• Abstract:

  This study aimed to characterise the calorimetry of 28 tropical wood species in the CIELab colour space. Employing a Minolta CM-2500d spectrophotometer, chromatic axes L* (Luminosity), a* (green-red), and b* (blue-yellow) were determined in xylarium samples, with six measurements per sample. The obtained values underwent an analysis of variance (ANOVA), a comparison of means using the LSD method (α=0.05) and cluster analysis by the average method. The observed and the average values of the chromatic axes were represented in the CIELab system using the Spectra Magic® software. Group representations of average values were done using the SigmaPlot program. The ANOVA showed significant differences (p ≤ 0.05) in the wood colour of the species in each of the chromatic axes, which allowed the formation of 7 similar groups with an explained variance ratio of 90.1%. Within the wood samples, variations were observed in the luminosity (L*, 24.6 – 81.2), in the a* axis (2.7 – 19) tending towards red, and in the b* axis (3.1 – 32.3) that tends towards yellow. The sapwood of the studied species has light colours due to its high luminosity with a tendency towards yellow on the b* axis, such as the wood of Bursera simaruba (L*, 79.66; b*, 21.49) and Zuelania guidonia (L*, 77.22; b*, 28.58). In contrast, the heartwood of Cordia dodecandra (L*,30.49; a*,4.89) and S. cubensis (L*, 27.01; a*, 8.07) shows dark reddish colours with low luminosity. Colour quantification allows for a more objective and measurable characterisation of the wood, facilitating the grouping of similar colours among tropical species.

   

• Número de páginas: 10