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We performed a comparative study of the effectiveness of ethyl silicate (TEOS) and dibasic ammonium phosphate (DAP) on two varieties of natural stone used in the architectural heritage of Andalusia (Spain): Arenisca Ronda (calcarenite) and Molinaza Roja (arkose). The consolidants were applied on healthy samples with a paintbrush, a method frequently used in real building works, and the study was divided...