Colorimetry in the conservation of assets integrated into heritage properties : comparative analyzes of hydraulic tiles

Abstract

With the advent of color measurement technologies in the area of architecture, design and cultural heritage, the use of colorimetry has enabled advances in the conservation of heritage properties, in a non-invasive way. In this sense, the object of study of the research is the Paço dos Açorianos of Porto Alegre - Rio Grande do Sul - Brazil, with thematic delimitation in the hydraulic tiles located in the entrance hall of the ground floor of the building which, currently, present various pathologies. The objective is to use a colorimeter to measure the color of the Paço tiles and compare it with the color sample of the Fábrica de Mosaicos de Pelotas, a company supporting the research and the largest in the segment in the State of Rio Grande do Sul. The methodology used consisted of measuring the samples produced by Fábrica de Mosaicos as a standard and the Paço tiles as a sample and comparing it with, evaluating the differences (deltas) between the measurements to determine if they are within the tolerance established for the color standard, as described by the manufacturer. The results indicated which colors obtained the greatest similarity. The tolerance value used follows the difference formula of CIEDE2000. The work is part of doctoral research that examines the feasibility of using technologies to conserve assets integrated into the building, emphasizing the historical and cultural importance of hydraulic tiles. He proposes a collaboration between science and industry to conserve and enhance these elements, with a view to future restoration works on the pavement.