Aesthetics Appreciation of Wood Colour and Patterns by Colorimetry: Part 1. Colorimetry Theory for the Cielab System

Janin, G.; Gonçalez, Joaquim Carlos; Ananías, Rubén A.; Charrier, Bertrand; Silva, Gilson Fernandes da; Dilem, A

doi:10.4067/s0718-221x2001000100001

Cited by 29 publications

(24 citation statements)

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“…Entretanto, características estéticas como cor e desenho são atributos importantes por direcionarem o uso da madeira para suas diferentes finalidades e estabelecerem o seu valor comercial (Janin et al, 2001). Möttönen et al (2002) também observaram que as características e a uniformidade da cor da madeira têm um papel direto no estabelecimento do preço e no valor final do produto.…”

Section: Introductionunclassified

Variação da Cor da Madeira de Teca em Função da Densidade e do Teor de Extrativos

Garcia

Marinonio

2016

Floresta Ambient.

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RESUMOO objetivo deste estudo foi avaliar o efeito da densidade e do teor de extrativos na variação da cor da madeira de teca (Tectona grandis L. f.) proveniente de plantios de diferentes espaçamentos. As análises colorimétricas foram realizadas nas faces radial e tangencial das madeiras de cerne e alburno com o espectrofotômetro CM 2600d no espaço de cor L*a*b*. A densidade e o teor de extrativos foram determinados segundo as normas ASTM D2395 e ASTM D1105. A madeira do maior espaçamento de plantio apresentou maior densidade e maior teor de extrativos. Na seção radial, as madeiras de cerne de maior densidade apresentaram mais pigmento amarelo, enquanto que na seção tangencial elas são mais escuras e apresentam menos pigmento amarelo. As madeiras de alburno de maior densidade são mais escuras e apresentam mais pigmento vermelho em ambas as seções. As madeiras mais escuras e com mais pigmento vermelho apresentaram um maior teor de extrativos.Palavras-chave: colorimetria, qualidade da madeira, sistema CIE L*a*b*. Color Variation of the Teak Wood as a Function of Density and Extractive Content ABSTRACTThe objective of this study was to evaluate the effect of density and extractive content on color variation of teak (Tectona grandis L. f.) wood from plantation of different tree-spacing. Color analyses were performed on radial and tangential sections of heartwood and sapwood by using a CM 2600d spectrophotometer on the L*a*b* color space. Density and extractive content were determined following the ASTM D2395 and ASTM D1105 standards. The wood from larger tree-spacing had higher density and extractive content. In the radial section, denser heartwoods had more yellow hue, while in tangential section, they are darker and had less yellow hue. Denser sapwoods are darker and had more red hue in both sections. Darker woods and with more red hue presented higher extractive content.

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Section: Introductionunclassified

Variação da Cor da Madeira de Teca em Função da Densidade e do Teor de Extrativos

Garcia

Marinonio

2016

Floresta Ambient.

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“…De acordo com vários autores (Janin et al, 2001;Mononen et al, 2002;Mori et al, 2005), as características estéticas da madeira (superfície e desenho) e a homogeneidade da cor têm desempenhado um papel importante para estabelecer os preços da madeira serrada e a comercialização de diversos produtos, tais como móveis e laminados decorativos.…”

Section: Introductionunclassified

Alteração da cor da madeira de teca por tratamento térmico

et al. 2014

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Color Change of Teak Wood by Heat Treatment ABSTRACTThe purpose of this study was to determine the effect of heat treatment on color change of teak wood (Tectona grandis L. f.) from plantations of different spacings. Heartwood and sapwood samples were heat treated at 180 and 200°C for 2.5 hours. Colorimetric analyses were performed using a CM 2600d spectrophotometer in the CIE L*a*b* system. After heat treatment, the wood presented loss of light, becoming darker, which was more pronounced for the treatment at 200°C. Heartwood and sapwood showed different behaviors for the a* and b* coordinates, depending on the spacing, before and after heat treatments. There was an increase on red hue and a decrease on yellow hue of heartwood and sapwood treated at 200°C.

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“…The colour determination can provide a useful means to classify, match and join pieces of wood in parquet floors, joinery, and furniture manufacturing (Janin et al 2001). …”

Section: Introductionmentioning

confidence: 99%

Impact of thermal modification on color and chemical changes of spruce and oak wood

et al. 2018

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A study of colour assessment, using the CIEL*a*b* system, was conducted with samples of Eucalyptus grandis wood thermally treated by the Brazilian industrial process of thermal modification, VAP HolzSysteme®, at three different temperatures, i.e. 140, 160 and 180 °C. Previous to the treatment, the samples were classified into three groups according to their distance to the wood pith, on the radial direction. All thermally modified samples presented a noticeable colour change, confirmed by high values of ΔE*. As the intensity of the treatment increased, the eucalypt samples presented an increase of red colour tone (a*) (up to 160 ºC) and a decrease of colour lightness (L*). Significant colour differences were found among the classified groups, for both untreated and thermally modified samples. The eucalypt samples groups showed different colour responses when thermally treated at 140 and 160 ºC. At 180 ºC the groups didn't show a significant colour response variation.

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Aesthetics Appreciation of Wood Colour and Patterns by Colorimetry: Part 1. Colorimetry Theory for the Cielab System

Cited by 29 publications

References 1 publication

Variação da Cor da Madeira de Teca em Função da Densidade e do Teor de Extrativos

Variação da Cor da Madeira de Teca em Função da Densidade e do Teor de Extrativos

Alteração da cor da madeira de teca por tratamento térmico

Impact of thermal modification on color and chemical changes of spruce and oak wood

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