L. Aires-Barros, M.J. Basto, R.C. Graça, A. Dionisio, F.M.A. Henriques, J. Delgado Rodrigues, A.E. Charola
December 3, 2014
Abstract
The cleaning of the exterior masonry of the Tower of Beiern proceeded according to schedule. It was carried out by application of water nebulization, light brushing and final rinsing by nebulized water. Areas that had more resistant stains, received extra brushing while wet and for harder crusts, such as found under corbels or recessed areas, microabrasion was used in conjunction with careful scalpel scraping where necessary. Grey areas resulting from endolithic biocolonization became evident as the cleaning progressed and given the scheduling constraints for the completion of the project, these areas received a lime-wash to give this monument visual homogeneity.