Pinit Conservation-Grade Backings for Art, Photos, Maps. 18 x 24-¼". .040" thick Alpha Cellulose board. Acid-free, Lignin-free, Buffered. All white. Indefinite Storage. SKU: KAF401824 (0)No Reviews yet Add to Shopping Cart Details Conservation Grade Backings forArtwork, Photos, Unfolded maps.18 x 24-1/4" .040" thick Alpha-Cellulose board.All white. Lignin-free. Acid-free. Buffe... Details Back DetailsConservation Grade Backings forArtwork, Photos, Unfolded maps.18 x 24-1/4" .040" thick Alpha-Cellulose board.All white. Lignin-free. Acid-free. Buffered. Contaminant-free. Meets the Library of Congress archival standards.Indefinite Storage. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review