Pinit Conservation-Grade Backings for 14 x 18" Images. 14-1/4 x 18-1/4 .040" thick Alpha Cellulose board. Acid-free, Lignin-free, Buffered. All white. Indefinite Storage. SKU: KAF401418 (0)No Reviews yet Add to Shopping Cart Details Conservation Grade Backing Board for 14 x 18" images. 14-1/4 x 18-1/4" .040" thick. All white. Lignin-free. Acid-free. Buffered. Contaminant-free. Mee... Details Back DetailsConservation Grade Backing Board for 14 x 18" images. 14-1/4 x 18-1/4" .040" thick. 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