Absorption of gilding in concert halls

Tapio Lokki, Jukka Pätynen

Research output: Chapter in Book/Report/Conference proceedingConference contributionProfessional

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Abstract

A few renowned concert halls have walls, statues, and ceiling surfaces covered at least partially with gilding. Despite its appearance, such material is not actually gold. Instead, it is composition gold, which is a very thin leaf of copper-tin-zinc alloy, finished with shellac lacquering. In order to investigate the effect of treatments on room acoustics, we asked an artisan, a Master Gilder, to prepare gypsum cylinders that were pre-cut to diameter of 29 mm for impedance tube measurement. The top surfaces of these specimens were treated either with composition gold, real 24 carat gold leafs without shellac, or linseed oil paint. The absorption coefficients of all these cylinders were measured with an impedance tube. Each specimen was measured on both sides to provide a direct comparison between different surface treatments to untreated gypsum. This paper describes the measurement process, the practical issues encountered in fitting the specimens tightly for measuring, and finally the results of the measurements. The results show that the absorption coefficient of the composition gold is 0.02 over a wide frequency range, and it absorbs approximately 50% less sound energy than bare gypsum.
Original languageEnglish
Title of host publicatione-Forum Acusticum
Pages1727-1730
Number of pages4
DOIs
Publication statusPublished - Dec 2020
MoE publication typeD3 Professional conference proceedings
EventForum Acusticum - Lyon, France
Duration: 20 Apr 202024 Apr 2021

Conference

ConferenceForum Acusticum
Country/TerritoryFrance
CityLyon
Period20/04/202024/04/2021

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