Spectroscopic analysis used to uncover the original paint colour of the Helsinki Government Palace tower clock faces

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http://hdl.handle.net/10138/232506

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Castro , K , Knuutinen , U , Fdez-Ortiz de Vallejuelo , S , Maguregui , M , Manuel Madariaga , J & Laakso , R 2016 , ' Spectroscopic analysis used to uncover the original paint colour of the Helsinki Government Palace tower clock faces ' , Heritage Science , vol. 4 , 36 . https://doi.org/10.1186/s40494-016-0100-7

Title: Spectroscopic analysis used to uncover the original paint colour of the Helsinki Government Palace tower clock faces
Author: Castro, Kepa; Knuutinen, Ulla; Fdez-Ortiz de Vallejuelo, Silvia; Maguregui, Maite; Manuel Madariaga, Juan; Laakso, Raili
Contributor: University of Helsinki, Department of Chemistry
Date: 2016-09-22
Language: eng
Number of pages: 9
Belongs to series: Heritage Science
ISSN: 2050-7445
URI: http://hdl.handle.net/10138/232506
Abstract: The paint stratigraphy of the two clock faces from the tower clock of the Government Palace in Helsinki (Finland) was analysed in order to determine their original colour before restoration works. Paint cross-section samples from both clock faces were analysed by confocal Raman microscopy and scanning electron microscopy coupled to an energy dispersive X-ray spectrometer (SEM-EDS). The results revealed the complex superimposition of paint layers applied over the original black colour. FTIR/ATR analyses proved that the original paint was prepared with linseed oil-resin media. Most likely not all of the different layer colours were visible. Some of the layers were likely to have been a primer or for rust protection.
Subject: Confocal Raman microscopy
Paint cross section
Tower clock
SEM-EDS
FTIR/ATR spectroscopy
Cultural heritage
PALEOLITHIC ROCK-PAINTINGS
X-RAY-FLUORESCENCE
RAMAN-SPECTROSCOPY
WALL PAINTINGS
IN-SITU
CONSERVATION STATE
CULTURAL-HERITAGE
CROSS-SECTIONS
PIGMENTS
FIELD
116 Chemical sciences
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