Termorretificação e colorimetria da madeira de eucalyptus grandis

Abstract

Heat treatment can be used to change the color of timber, adding value to it. In this study, we aimed to evaluate changes in color of Eucalyptus grandis wood subjected to 140, 170, 200, and 230 °C for three, five, and seven hours. Samples of 2 × 2 × 2 cm were dried and heat treated to evaluate lightness (L), a* coordinate (green-red coordinate), b* coordinate (blue-yellow coordinate), saturation (C), and tonality angle (H). Lightness (L *) decreased as from 140°C. a* coordinate (green-red coordinate) decreased as from 140°C for five hours. b* coordinate (blueyellow coordinate), saturation (C), and tonality angle (H), saturation, and ink angle reduced as from 170°C. Temperature was more effective than time to change the color of timber. Heat treatment darkened the wood and can be an alternative to add value to this material.