Core The internal material of an object. In picture framing, "core" refers to multiple materials:
1. the cotton fiber filling between the colored surface and backing of mat boards, which may be white or black. The part that is visible in the bevel along the opening.
2. Foam core, a lightweight but firm material used as the backing in framed artwork. It is constructed of a thin (approximately 1/4â€) foam sheet sandwiched between layers of thick, generally glossy, paper. |
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