
Cartonnage is a type of material composing Egyptian funerary masks from the First Intermediate Period onward. It was made of layers of linen or papyrus covered with plaster. Some of the Fayum mummy portraits are also painted on panels made of cartonnage. ==Technique== In a technique similar to papier-mâché, scraps of linen or papyrus were stuck ...
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http://en.wikipedia.org/wiki/Cartonnage

Papyrus or linen soaked in plaster, shaped around a body. Used for mummy masks and coffins.
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https://www.encyclo.co.uk/local/10138

layers of plaster mixed with linen or papyrus. This could be moulded to shape for mummy masks and casings. It was often painted and gilded.
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https://www.encyclo.co.uk/local/21277
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