20.500.12556/RUL-140874 Ebonizacija svetlih lesov Ebonisation of light colored woods Ebonizacija je tehnika površinske obdelave lesa pri kateri je končni rezultat počrnela površina. Pripravili smo radialno in tangencialno usmerjene vzorce izbranih lesni vrst 4 iglavcev in 18 listavcev ter jim določili vlažnosti. Na podlagi preliminarnega poizkusa smo pripravili raztopino železovega acetata (10 g/l) in raztopino tanina z destilirano vodo v razmerju 1 : 9 (1 enota tanina / 9 enot vode). S temi raztopinami smo premazali površine vzorcev in nato barvne spremembe ovrednotili vizualno in po CIELAB barvnem sistemu. Vzorce smo nato umetno starali z izpostavitvijo UV svetlobi, zatem pa ponovno izvedli CIELAB analizo. Ugotovili smo, da kombinacija tanina in železovega acetata učinkovito potemni, ebonizira vse lesne vrste, ki smo jih proučevali v naši raziskavi. Pri eboniziranih lesovih iglavcev se rani les obarva temneje kot kasni les. Difuzno porozni listavci imajo bolj homogen barvni odtenek, kot venčasto porozni, na katerih ostaja nehomogenost lesnega tkiva izrazita. Ugotovili smo, da so se barvne spremembe pojavile samo na površini lesa. Poizkus umetnega staranje je pokazal, da je ebonizirana površina je ebonizira površina zbledela in tako ni obstojna na izpostavitev UV svetlobi. Ebonisation is a wood surface treatment technique in which the end result is a blackened surface. We prepared radial and tangential samples of selected wood species from 4 conifers and 18 deciduous trees and determined their moisture contents. On the basis of a preliminary test, a solution of ferric acetate (10 g/l) and a solution of tannin with distilled water was prepared in a ratio of 1 : 9 (1 unit of tannin / 9 units of water). These solutions were applied to the sample surfaces and the colour changes were then evaluated visually and using the CIELAB colour system. The samples were then artificially aged by exposure to UV light, after which the CIELAB analysis was carried out again. We found that the combination of tannin and ferric acetate effectively darkened, ebonised all the wood species studied in our study. In ebonised coniferous wood, earlywood is darker in colour than latewood. Diffuse-porous hardwoods have a more homogeneous colour shade than coronary-porous hardwoods, where the inhomogeneity of the wood tissue remains pronounced. We found that the colour changes occurred only on the surface of the wood. The artificial ageing test showed that the ebonised surface is a faded ebonised surface and thus not resistant to UV light exposure. les potemnitev lesa premazi železov acetat tanini wood darkening of wood surface coatings iron acetate tannins true false false [J. Skerbiš] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2022-09-21 07:16:57 2022-09-21 07:17:03 2022-10-04 08:08:30 0000-00-00 00:00:00 2022 0 Ljubljana 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*813.9:630*829.18 211630 124014083 DIP_Skerbis_Jernej_2022.pdf DIP_Skerbis_Jernej_2022.pdf 1 D20375B26343D8CFB5C5D02EA2F05F68 6bbcfba97e47d4999d9c75de6684e97832556c83a7b72402636cf0e25177e828 8d0bcd64-396c-11ed-92af-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=161699 Biotehniška fakulteta 0 0 0