The colour and the changes of colour of wood during weathering

The colour of wood depends on the chemical components of wood that interact with light. Hence, the reaction of wood components to light, heat and chemicals will change the colour of the wood. Discolouration occurs both indoors and outdoors. In this paper we focused on the colour changes of wood during weathering. Colour measurements were taken with a spectrophotometer on fir wood and oak wood panels, both uncoated and coated with a clear film-forming water-based stain wifh various photostabilisers. The colour changes recorded on the wood panels during accelerated weathering are different from the colour changes recorded on the woodpanels during outdoor exposure. The results indicated that the various stabilised clear film forming water-based stains used are not effective in preventing wood discolouration during weathering. The last color changes during weathering were measured on samples treated with semitransparent wood stain.