Correlation between hue angle and lightness of light irradiated wood

Laszlo Tolvaj, Katsuya Mitsui

Research output: Contribution to journalArticle

40 Citations (Scopus)


The objective of this study was to investigate irradiation characteristics of Beech (Fagus crenata Blume), black locust (Robinia pseudoacacia L.), Japanese cedar (Cryptomeria japonica D. Don) and spruce (Picea abies Karst.) wood samples by sunlight, xenon light and mercury vapour light. The colour change of the samples was evaluated by CIE L*a*b* and L*h*c* colour co-ordinate systems. It was found that the samples showed a rapid colour change at the initial period of treatment but the rate of change decreased with treatment time. It was determined that neither xenon nor mercury lamp light can accurately simulate sunlight. A wide range of colour changes were caused by the applied light sources. In spite of this wide colour range a good linear correlation was found between the lightness and the colour hue. The coefficients of determination (R2) are between 0.7 and 0.96. Accordingly, this linear correlation gives the possibility of following the colour change during photodegradation by measuring only the lightness.

Original languageEnglish
Pages (from-to)638-642
Number of pages5
JournalPolymer Degradation and Stability
Issue number4
Publication statusPublished - Apr 1 2010


  • Colour change
  • Hue angle
  • Lightness
  • Photodegradation
  • Wood

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Polymers and Plastics
  • Materials Chemistry

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