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Materials Engineering of Violin Soundboards by Stradivari and Guarneri
Author(s) -
Su ChengKuan,
Chen SzuYu,
Chung JenHsuan,
Li GuoChian,
Brandmair Brigitte,
Huthwelker Thomas,
Fulton John L.,
Borca Camelia N.,
Huang ShingJong,
Nagyvary Joseph,
Tseng HsiaoHan,
Chang ChihHui,
Chung DaiTing,
Vescovi Rafael,
Tsai YiShiuan,
Cai Wenjie,
Lu BingJyun,
Xu JiaWei,
Hsu ChiaShuo,
Wu JunJie,
Li HaoZhi,
Jheng YuKai,
Lo ShengFong,
Chen Hao Ming,
Hsieh YiTing,
Chung PoWen,
Chen ChienSheng,
Sun YuhChang,
Chan Jerry Chun Chung,
Tai HwanChing
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202105252
Subject(s) - hemicellulose , cellulose , materials science , lignin , mineralogy , chemical engineering , chemistry , composite material , polymer science , organic chemistry , engineering
We investigated the material properties of Cremonese soundboards using a wide range of spectroscopic, microscopic, and chemical techniques. We found similar types of spruce in Cremonese soundboards as in modern instruments, but Cremonese spruces exhibit unnatural elemental compositions and oxidation patterns that suggest artificial manipulation. Combining analytical data and historical information, we may deduce the minerals being added and their potential functions—borax and metal sulfates for fungal suppression, table salt for moisture control, alum for molecular crosslinking, and potash or quicklime for alkaline treatment. The overall purpose may have been wood preservation or acoustic tuning. Hemicellulose fragmentation and altered cellulose nanostructures are observed in heavily treated Stradivari specimens, which show diminished second‐harmonic generation signals. Guarneri's practice of crosslinking wood fibers via aluminum coordination may also affect mechanical and acoustic properties. Our data suggest that old masters undertook materials engineering experiments to produce soundboards with unique properties.