The quality can vary greatly. Air Space A space between the art and the glazing in a frame. It should be big enough to ensure the art will not come in contact with the glazing. Art back to top 6. They are made from Japanese paper and, generally, used with wheat or rice starch paste.
Hinges are one type of preservation mounting.
They are used to hold the art to the back mat while allowing it to expand and contract with minor changes in temperature and humidity. A preservation quality mat board on which the art is attached. A board, generally foamboard, used in the back of a frame assembly to occupy a vacant space or provide rigidity. A final backing material, usually paper, that covers the entire back of a frame to prevent dust from entering the package. A small self-adhesive pad, made of rubber, cork or felt that is fixed to the bottom corners of the dust cover or back of the frame to hold the frame away from the wall.