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"If the here proposed silica gel based technology can be further confirmed for Inca masonry this would raise the level of their work from “no secret formula beyond a primitive working technique based on stone tools” (Protzen,1986,1993) to an astonishing chemical-technical engineering standard."

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On the reddish, glittery mud the Inca used for perfecting their stone masonry 249 WVK 11-Feb-18 17:07


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