Animal bones used in construction of Spanish walls

Archaeologists studying the chemistry of 14th century Moorish architecture have found that burnt animal bones were mixed with other materials to create a protective covering for walls. Analysis of the walls, coupled with the discovery of a 14th century brick oven, have led to the conclusion.

The technique is very old. In fact, previous studies have shown that bone material was used in Christian and Celtic architecture, but this is the first documented use in Moorish architecture. Carolina Cardell said, “(T)he results of this work are significant for archaeologists since this is the first report of burnt bones in a patina on a Muslim monument, as well as the archaeological artifacts — the oven and raw materials — used to produce them."