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.
3 Archeological Significance,
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In a technique similar to papier-mâché, scraps of linen or papyrus were stuck together with plaster or resin and used to make mummy cases and masks. After the material dried it could be painted or gilded and molded to the shape of the body, forming a type of shell. The shell could be decorated with geometric shapes, deities, and inscriptions. During Ptolemaic times the single shell method was altered to include four to six pieces of cartonnage. There would generally be a mask, pectoral, apron, and foot casing. In certain instances there were two additional pieces used to cover the ribcage and stomach.
The materials used to produce cartonnange changed over time. In the Middle Kingdom it was common to use plastered linen, during the Third Intermediate period, linen and stucco,during the Ptolemaic period, old papyrus scrolls and during the Roman period, thicker fibrous materials. Reusing papyrus that was considered waste was a common practice during the Ptolemaic period. A lot of discarded documents from the government and archives were used for this purpose.
The preparation of cartonnage preserved the sections of papyrus,therefore, it is a prominent source of well-preserved manuscript sections. In 1993, the city of Helsinki received fourteen fragments of cartonnages from the Egyptian Museum in Berlin. Conservators were tasked with perserving the cartonnages and publishing all Greek papyrus texts derived from them.