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In this study, seven types of low density, machine\u2010made Japanese washi\u2010papers were selected and used for a comprehensive comparative analysis investigating their properties. These low\u2010density papers have not yet been studied intensively. The mechanical properties of each paper sample have been compared according to three different testing devices, and the morphology of fibers was analyzed employing optical microscopy. In this study, three different and unique instruments were used for performing the tensile strength measurements. Characteristics such as: lightness, color, grammage, thickness, and tensile strength for each paper sample were statistically analyzed to determine the generalized features of the papers. Consequently, this study contributes to a better understanding of the inherent mechanical properties of low\u2010density Japanese papers, as well as simultaneously improving on the existing knowledge of machine\u2010made papers made from inner layer of bast fibers. In connection with the obtained results, the specific use of Japanese washi\u2010papers in the field of conservation and restoration technologies can be recommended. Understanding the characteristic mechanical and optical properties of low\u2010density machine\u2010made Japanese washi papers enables more informed material selection in conservation and restoration practice, including the potential use of papers with lower density than traditionally employed, thereby ensuring adequate mechanical support while achieving improved visual integration and preservation of the historical authenticity of treated objects.<\/jats:p>","DOI":"10.1002\/cplu.202500480","type":"journal-article","created":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T17:05:37Z","timestamp":1779901537000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Characterization of Selected Mechanical and Optical Properties of Low\u2010Density Japanese Papers"],"prefix":"10.1002","volume":"91","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6758-925X","authenticated-orcid":false,"given":"Aldona","family":"J\u0119drusik","sequence":"first","affiliation":[{"name":"Department of Graphic Arts Technology and Applied Photochemistry Slovak University of Technology in Bratislava  Bratislava Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michal","family":"\u010eurovi\u010d","sequence":"additional","affiliation":[{"name":"Department of Chemical Technology of Monument Conservation University of Chemistry and Technology Prague  Prague 6 Czechia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Milena","family":"Reh\u00e1kov\u00e1","sequence":"additional","affiliation":[{"name":"Department of Graphic Arts Technology and Applied Photochemistry Slovak University of Technology in Bratislava  Bratislava Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ida","family":"Skotnicov\u00e1","sequence":"additional","affiliation":[{"name":"Department of Wood, Pulp and Paper Slovak University of Technology in Bratislava  Bratislava Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,5,14]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10570\u2010022\u201004618\u20102"},{"key":"e_1_2_9_3_1","volume-title":"The Chemistry of Paper","author":"Roberts J. 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