Acid-free and neutral pH in 4 ply. For mounting or framing when permanence is a primary consideration, we suggest using Museum Board. Rising manufactures one of the finest available. It is 100% cotton, acid-free and neutral pH and buffered with calcium carbonate for added protection. The board has a smooth surface, which is also suitable for painting and drawing. All five colors are faderesistant, and extend through the board.
Museum Board - Gray 20 x 30 in.
There is a 5-board minimum purchase on this item, in any combination of colors. Normally shipped surface.