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Proceedings Paper

Colour measurements of surfaces to evaluate the restoration materials
Author(s): Angela Lo Monaco; Maurizio Marabelli; Claudia Pelosi; Rodolfo Picchio
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Paper Abstract

In this paper two case studies on the application of colour measurements for the evaluation of some restoration materials are discussed. The materials related to the research are: watercolours employed in restoration of wall paintings and preservative/consolidants for wood artifacts. Commercial watercolours, supplied by Maimeri, Windsor&Newton and Talens factories have been tested. Colour measurements have been performed by means of a reflectance spectrophotometer (RS) before and after accelerated ageing of watercolours at 92% relative humidity (RH) and in a Solar Box chamber. The experimental results show that watercolours based on natural earths and artificial ultramarine undergo the main colour changes, expressed as L*, a* and b* variations and total colour difference (▵E*). In the other cases colour differences depend on both watercolour typology and suppliers. The other example concerns the evaluation of colour change due to surface treatment of Poplar (Populus sp.) and chestnut (Castanea sativa L.) wood samples. The wooden samples have been treated with a novel organic preservative/consolidant product that has been tested also in a real case as comparison. The treated samples have been artificially aged in Solar Box chamber equipped with a 280 nm UV filter. Colour has been measured before and after the artificial ageing by means of a RS. Colour changes have been determined also for the main door of an historical mansion in Viterbo, made of chestnut wood, and exposed outdoors.

Paper Details

Date Published: 6 June 2011
PDF: 14 pages
Proc. SPIE 8084, O3A: Optics for Arts, Architecture, and Archaeology III, 80840P (6 June 2011); doi: 10.1117/12.889147
Show Author Affiliations
Angela Lo Monaco, Univ. degli Studi della Tuscia (Italy)
Maurizio Marabelli, Univ. degli Studi della Tuscia (Italy)
Claudia Pelosi, Univ. degli Studi della Tuscia (Italy)
Rodolfo Picchio, Univ. degli Studi della Tuscia (Italy)

Published in SPIE Proceedings Vol. 8084:
O3A: Optics for Arts, Architecture, and Archaeology III
Luca Pezzati; Renzo Salimbeni, Editor(s)

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