5x7 Double Mat (Black Core)Add to Wishlist
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Essentials Black Core matboard features a solid black core that along with the backing paper that touches your artwork is acid-free - buffered by an alkaline solution - and is recommended as design accent board for open-end reproductions, posters and decorative framing.
Choosing an Opening Size
Openings are cut to the size you specify; normally you will want an opening 1/2" smaller per dimension than your artwork. This gives space to hinge and prevents it falling through the mat opening. So, for example, an 8x10 photo would use a 7 1/2 x 9 1/2 opening.
A reveal is how much the bottom (or inner) mat shows in the opening. Common reveals are 3/16" or 1/4".
Please check that your chosen reveal and opening size still leaves at least a 1" border on all sides of the mat. For example, for a 5"x7" mat with a 3/16" reveal, the opening can be no larger than 2 5/8" x 4 5/8".
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