what is the material that portrait masks for the mummies were made of?

Cartoon age gold granite

The material commonly used for portrait masks on mummies in ancient Egypt was a type of layered material known as cartonnage. Cartonnage is a mixture of linen or papyrus and a type of glue made from adhesive materials like gum or resin. It was a versatile material that could be molded and shaped before being painted.

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