Abstract
The Feathered Serpent Pyramid at Teotihuacan, Mexico, is one of the most outstanding monuments of Mexican archaeological heritage. However, the volcanic stones that constitute the main façade of this building are subject to complex deterioration phenomena that include decay caused by the presence of water and soluble salts, as well as inappropriate treatments carried out in past decades. Agents of decay are explained in the article, as well as the means of diagnosis employed for their study. Recent conservation activities and other potential conservation treatments are also discussed.
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