Crescent - Black Core Flannels Matboard - 32x40 - Silver Gray - The Flannel line of Crescent Black Core Matboards have been specially textured to resemble flannel. These Black Core boards add contrast and drama to your mat designs by creating a black bevel. The black core series of mat boards by Crescent consist of a dyed black wood pulp core which has been buffered to a neutral pH and is topped with a layer of acid-free paper in a wide choice of colors. Crescent Black Core cuts cleanly, with no rub-off. The surface is made of the same high-quality, bleed and fade resistant paper as regular boards. Crescent Black Core Matboard is suitable for the vast majority of non-conservation matting and framing applications.