Reverse of the Frame

Canvases and panels are usually backed with either plywood or MDF. In the former case a window is cut to allow access to the stretcher pegs. The back of the frame is sealed with either Framers Tape or gum strip.
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Works on paper are backed with Art-Bak board, which has a water resistant coating and is acid free, or for larger works, MDF or plywood. Very large works will require 6mm MDF. Standard fixings are D-rings and cord (used for most domestic hanging), other options are strap hangers and split battens.