Your search resulted in 143 documents. Displaying 25 entries per page.
Colour changes in unpainted wooden façades – Fifty Shades of Grey
2018 - IRG/WP 18-10903
…and trendy aesthetic appearance.
The variation in colour and pattern seen in an unpainted weathered wooden façade tells the story of the chosen design and construction and the loads of the environmental factors the building is exposed to. Usually unpainted façades do not get an even and homogeneously grey…
K Zimmer, L R Gobakken, O Flindall, M Nygaard
Effects of microclimate, wood temperature and surface colour on fungal disfigurement on wooden claddings
2012 - IRG/WP 12-20490
…The visual changes that occur during weathering can be colour changes, abrasion or wear, blistering, flaking, and even cracks in the wood or coating, but more often growth of mould and blue stain fungi are the main challenge. A field test with synchronous monitoring of relative humidity, air temperature, material…
L Ross Gobakken, G I Vestøl
Comparison of colour change in wood clear-coating systems including inorganic and organic UV absorbers for exterior use
2010 - IRG/WP 10-40499
…against weathering. Our study has investigated the colour changes of selected UV absorbers; hombitec 402 RM from the Sachtleben Company as an inorganic UV absorber, tinuvin 477 DW from the Ciba Company as an organic UV absorber. The study was carried out on two wood species; Fagus sylvatica L., Pinus…
Ö Özgenç, B Forsthuber, A Teischinger, C Hansmann
Colour change monitoring of photodegradation in Scots pine (Pinus sylvestris) – a short term focus
2009 - IRG/WP 09-40442
Colour change monitoring of photodegradation is a quick and easy method for monitoring rates of photodegradation in timber. A study was undertaken to compare this technique to other monitoring methods, including microtensile strength changes and weight loss.…
V Sharratt, C A S Hill, D P R Kint
The Effect of Flavonoids on Colour and Spectral Changes of the Wood Surface Caused by Heat Treatment or Ultra-violet Irradiation
2006 - IRG/WP 06-40341
Both heat treatment and UV irradiation can cause discolouration and change in the spectral properties of wood surface. Some of the characteristic flavonols have significant role on colour and spectral changes, despite of their relative small quantities in wood.
Colour changes and spectral properties of…
R Csonka-Rákosa, L Molnár-Hamvas, E Börcsök, J Molnár, K Németh
Correlation between changes in colour and chemical composition during photo-degradation of wood surfaces
2005 - IRG/WP 05-40301
Changes in colour of wood (yellowing) during photo degradation or weathering reflect chemical changes in wood. Therefore, the relationship between changes in chemical composition and CIELAB colour parameters is very important to characterize photodegradation of…
K K Pandey
Safer alternative reagents for colour differentiation of heartwood and sapwood
1994 - IRG/WP 94-20028
Benzidine and dimethyl yellow reagents have been used for distinguishing heartwood from sapwood in the Pinaceae and Araucariacae families, and in Eucalypt species. Both have been classified as carcinogenic by European and United States authoritites, yet the ne…
A Zosars, M J Kennedy
Towards a colour assay of wood degradation
1982 - IRG/WP 2180
A colour assay for the enzyme catalase is described. Since the activity of this enzyme has previously been shown to be correlated with degree of wood degradation as determined by other methods, this assay may provide a rapid quantitative indicator of…
M A Line
Wood protection techniques and natural weathering: their effect on aesthetics and preference of people
2019 - IRG/WP 19-50351
…qualities of treated (and weathered) wood influence human preference and material selection. To investigate this, we prepared 30 wood samples from several species that are either untreated or treated. As a first step, we assessed several sensory (i.e., colour CIE L*a*b*, gloss) and evaluative (e.g., naturalness)…
D Lipovac, M D Burnard, A Sandak, J Sandak
Field-testing of Norway Spruce Claddings with Monitoring of Moisture Content, Material Temperature and Microclimate
2012 - IRG/WP 12-20502
…The visual changes that occur during weathering may be colour changes, abrasion or wear, blistering, flaking, and even cracks in the wood or coating, but more often growth of mould and blue stain fungi.
A field test with claddings was established in southern Norway to study the variation in moisture content…
G I Vestøl, L Ross Gobakken
Real-time evaluation of connected in-ground termite stations in laboratory colonies of Coptotermes gestroi and Prorhinotermes sp.
2025 - IRG/WP 25-11082
…made of specific plant fibers to analyze termite trophic preferences and exploration dynamics.
The results show that the two substrates are consumed in different proportions, and that both species exhibit distinct feeding behaviors. Notably, C. gestroi shows a marked preference for the neutral cartridges over…
M Butin, F Chopinet, S Savriama, D Messaoudi
Predicting weather resistance of Recoated Outdoor Wood by Near Infrared Diffuse Reflectance Spectroscopy
2025 - IRG/WP 25-20757
…type of semi-transparent alkyd stains by brushing. Three colours of stain (brown, light brown, dark brown) were used. Optical diffuse reflectance spectra were obtained in the range of 250 nm-2000 nm using a UV-VIS NIR spectrophotometer for recoated specimens that were prepared. In addition, specimens were subjected…
M Murai, M Itani, K Isoda
The impact of common fire retardancy salts and minerals on further properties of wood
2025 - IRG/WP 25-30821
…other key properties, such as fixation durability, colour stability, and mechanical properties, require further investigation. This study examines these aspects in mineralised fir (Abies alba), mineralised European oak (Quercus spp.), and mineralised European beech (Fagus sylvatica). Additionally, the wood…
T Franke, T Volkmer
Properties of plasma etched super black wood
2025 - IRG/WP 25-30825
…that are partly responsible for its structural super-black colour are not resistant to scuffing. Similarly, the super-black colour of Nxylon is lost when it is exposed to UV radiation. We were able to overcome both of these shortcomings by treating wood surfaces with transparent polymers. We anticipate that the…
K J Cheng, X Xu, V A Hernandez, P D Evans
Plasma Modification of Basswood Creates Super-Black Wood
2025 - IRG/WP 25-30826
…averaging 0.68% (300–700 nm). The super-black colour of plasma-modified wood is retained when it is coated with gold/vanadium alloy indicating structural coloration. Plasma creates a low density, lignin-enriched surface with deep pits, columns and tangled fibrils; features also found in synthetic…
K J Cheng, D Feng, M Turner, L Schmidt, P D Evans
Introduction of UV absorbers to wood surfaces via atom transfer radical polymerization
2025 - IRG/WP 25-30834
…vinyl polymers onto the wood surface. Moreover, the colour difference (ΔE*) of the samples also changed only slightly. These results showed that the grafted UV-absorbing vinyl polymers protect the cell wall structure of the wood surface against UV light.
K Maezaki, Y Mori, M Kiguchi
Performance Verification of Water-Based Outdoor Wood Protection Coatings Based on Weather Resistance Evaluation
2025 - IRG/WP 25-41015
…in the Japanese market, measuring and comparing the colour difference, gloss retention, water repellency, and the occurrence of cracks and deterioration of the paint film. We also verified the leaching of active ingredients from preservative-treated wood coated with this paint. As a result, it was confirmed…
N Ikemoto
Enhancing Wood Greying: A Study of Pre-Treatments and Iron(II) Sulphate Application
2025 - IRG/WP 25-41018
…is artificial greying with iron ions, providing a uniform colour that later transitions to natural greying. However, these shades differ from naturally aged wood. If the wood is pre-aged before the iron ions are applied, the surface develops a greyer shade. In our study, we investigated how different accelerated…
B Lesar, M Humar, A Kordiš
Effect of photodegradation on fungal colonization on wood during initial stage of brown-rot decay
2025 - IRG/WP 25-41024
…in wood microstructure, chemical composition, surface colour, crystallinity, fungal colonization pathways, and photodegradation products after weathering and decay were evaluated and characterised. The results showed that both weathering and decay led to obvious colour change on wood surface. The…
Y Wang, Y Peng, J Cao
Colorimetric performance of temperate wood species under tropical weathering
2025 - IRG/WP 25-41041
…chromaticity coordinates, which were used to calculate the colour difference (ΔE). Wood colour monitoring was carried out weekly during the first four months of testing. Subsequently, measurements were taken at four-week intervals. Wood colour monitoring was carried out weekly during the first four months of…
K da Silva Pereira, S J da Costa Lima, M F C Santos, L Emmerich, C Brischke, D C Batista
A novel treatment for increasing UV stabuility of wood based on citric acid and urea
2024 - IRG/WP 24-30811
…and weathering, notably UV degradation leading to colour changes. This study explored a novel treatment method utilising citric acid and urea to enhance the UV stability of wood. The reaction between these compounds forms fluorescent species and insoluble nanoparticles upon thermal treatment. Two treatment…
S Jué, A Scharf, C-F Lin, R Moutou Pitti, D Sandberg, D Jones
Characterization of the fungal communities associated with Aquilaria crassna Pierre ex Lecomte plantations in French Guiana
2023 - IRG/WP 23-11001
…also known as agarwood. The blackened wood has a darker colour than healthy wood and gives off a strong fragrance greatly appreciated by perfumers and by certain oriental religious communities. Production of this blackened wood is deemed to depend on environmental factors, including fungi. The purpose of this work…
C Zaremski, C Malandain, O Sibourg, B Heuclin, N Amusant, M Ducousso, A Zaremski
Sensitivity of copper indicators for detecting preservative penetration
2023 - IRG/WP 23-20701
…into various concentrations of Cu solutions (from CCA) and colour changes were evaluated using ultraviolet/visible (UV-vis) spectroscopy. End-matched slash pine sapwood cross sections (Pinus elliottii) treated to retentions of 0.6, 1.7, 2.8, 5.7, 14.2, 28.5, 50, 75, 100 ppm Cu were used to evaluate the detection…
T Yi, J Norton, S Meldrum, J J Morrell
Performance of a noise barrier with different wood materials – results from a service trial after 25 years of exposure
2023 - IRG/WP 23-30776
…subject to graffiti, and it was not easy to evaluate any colour changes. However, the coated Scanimp KF section as well as the CCA- and Royal-treated sections seem to have kept their original colours best. The larch had become black and its colour was far from the original light reddish colour.
The trial shows…
J Jermer, M Westin
Influence of weathering of wood surfaces before and after treatment with iron(II) sulphate
2023 - IRG/WP 23-30786
…this way, the wood greys quickly and evenly. However, the colour after iron treatment also depends on the previous ageing of the wood. In our study, we observed the colour change as a function of outdoor weathering. Before treatment, the samples were exposed to outdoor weathering for different periods of time and…
B Lesar, M Humar, F Osvald