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Colour assays: An inside look into Alentejo traditional limewash paintings and coloured lime mortars
Author(s) -
Gil Milene,
Aguiar Jose,
Seruya Ana,
Veiga Rosário,
Carvalho Luisa,
Vargas Helena,
Mirão Jose,
Candeias Antonio
Publication year - 2011
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1002/col.20584
Subject(s) - lime , carbonation , mortar , painting , pigment , pulp and paper industry , materials science , chemistry , mineralogy , environmental science , art , metallurgy , visual arts , composite material , engineering
Abstract A series of colour assays were conducted taking into account old bibliographic recommendations and oral testimony regarding traditional lime painting technology from the Alentejo (South Portugal) region. The main objectives were: (a) the colorimetric analysis of paintings made with different limewash preparation methods; (b) the comparison between natural processed red and yellows ochre pigments (“home made” and from industrial origin) and synthetic iron oxides in different concentrations and lime proportions; (c) the evaluation of the colorimetric CIELAB coordinates during the lime carbonation process in coloured mortars and limewashes. The results shows that the evolution of L *, a *, and b * during the carbonation process is independent of pigment concentration and paint thickness but dependent of pigment composition and finishing technique (lime painting or coloured mortar). They also emphasize the importance of surface appearance attributes and its influence on the colorimetric parameters. © 2010 Wiley Periodicals, Inc. Col Res Appl, 36, 61–71, 2011