Science

Hidden Codex May Reveal Secrets of Life in Mexico Before Spanish Conquest

High tech imaging in 2016 has revealed exceptionally rare manuscript overlaid gesso on a 16th-century deerhide document, Codex Seldon, held at Oxford University.  Researchers using hyperspectral imaging, a technique originally used for geological research and astrophysics, discovered the underlying images hidden beneath a layer of gesso, a plaster made from ground gypsum and chalk, without damaging the priceless later manuscript.

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