Fungal pigments from spalting fungi Scytalidium cuboideum (red), Scytalidium ganodermophthorum
(yellow) and Chlorociboria aeruginosa (green), were used to attenuate the presence of blue sap-stain in
Pinus spp. samples. Pigments, filtered from liquid cultures of spalting fungi, were vacuum impregnated
into pine samples with three different levels of blue staining: 1 [0e50%], 2 [50e90%] and 3 [100%]. The
CIE L*a*b* color difference at wood surfaces, before vs. after treatment, was quantified with a chroma
meter and the internal color coverage in the core of the samples with digital images. Light microscopy
was used to observe the penetration of pigment in the microstructure of blue stained pine samples.
Results show that fungal pigments are suitable candidates to attenuate the appearance of blue stain on
the wood surface. Pigments produced by S. cuboideum showed a higher color difference regardless of the
blue stain level, but the highest color difference was obtained in samples with staining level 1. The
percentage of internal color coverage of pigments was significantly higher for green and red pigments in
staining levels 1 and 2. The proposed treatment may be used to improve the value of blue stained wood
allowing its commercialization into the niche of environmentally friendly products.
Fungal pigments from spalting fungi Scytalidium cuboideum (red), Scytalidium ganodermophthorum(yellow) and Chlorociboria aeruginosa (green), were used to attenuate the presence of blue sap-stain inPinus spp. samples. Pigments, filtered from liquid cultures of spalting fungi, were vacuum impregnatedinto pine samples with three different levels of blue staining: 1 [0e50%], 2 [50e90%] and 3 [100%]. TheCIE L*a*b* color difference at wood surfaces, before vs. after treatment, was quantified with a chromameter and the internal color coverage in the core of the samples with digital images. Light microscopywas used to observe the penetration of pigment in the microstructure of blue stained pine samples.Results show that fungal pigments are suitable candidates to attenuate the appearance of blue stain onthe wood surface. Pigments produced by S. cuboideum showed a higher color difference regardless of theblue stain level, but the highest color difference was obtained in samples with staining level 1. Thepercentage of internal color coverage of pigments was significantly higher for green and red pigments instaining levels 1 and 2. The proposed treatment may be used to improve the value of blue stained woodallowing its commercialization into the niche of environmentally friendly products.
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