It’s generally OK to use an acidic mat on inexpensive, easily replaceable pieces, like posters. However, if you’ve purchased prematted artwork or have a piece that was matted a long time ago and you aren’t sure what type of matting was used, it might be worth replacing it with a nonacidic mat to be safe. Decorative mats are the least expensive mats available, and some framers don’t even carry them because the cost difference between them and acid-free mats is negligible.
Regular mat board (also called paperboard). Regular mat board is still made of wood pulp, but it’s been acid-neutralized. This is the most commonly used mat material and is advertised as “acid-free.” It should last about a hundred years or so. Acid mat board does cost more than regular (acidic) paper mats, but not much more. This type of matting is best for most pieces, like low- to mid-range artwork and photos.
One hundred percent cotton rag mats (also known as rag mats). These are constructed of a cotton rag core and backing paper, which rests near the artwork. Rag mats are acid-free and high-quality for most works of art. Like regular mat board, this type of matting is also appropriate for artwork that doesn’t need a high degree of conservation. Rag mats can be used for anything from cherished family photos to watercolor paintings.
Conservation or archival mat board. This is the most expensive, least acidic material. It’s made of pH-neutral cellulose that’s been treated to be inert for hundreds of years and is used on more valuable pieces and works that require the highest level of preservation.
Other mat materials include vellum, suede and fabric-wrapped mats, such as linen. The green mats shown here are fabric-wrapped.
from Houzz http://ift.tt/1oB7Elh
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