The term refers to special methods and materials used to frame an item of significant sentimental or monetary value. Various items require different considerations, but here are the basic rules:
- Framing should involve no permanent changes to the item; no trimming, folding, pressure sensitive or heat-activated glues or tapes.
- Mounting should be completely reversible at any future time, with the use of non-destructive materials and procedures. The item should be easily restorable to its original condition.
Matboard – Window mount
- Mats and backings in direct contact with the item should be museum-grade, 100% cotton ragboard or lignin-free alpha-cellulose board.
- “Acid-free” standard wood-pulp matboards are not museum-grade and would eventually cause damage.
Framing should provide protection from expected environmental hazards.These could by any or all of the following – temperature and humidity changes, dirt, insects, and airborne contaminants.
- Glazing (glass or acrylic) should be an ultraviolet light-filtering type, to prevent fading. Common non-glare glazing has no more protective qualities than regular glass. UV filters are invisible coatings on the inside.
- Glazing should not press against the framed item. Mats or spacers should be provided to hold them apart. The resulting air gap is important.