Museum Grade Storage Box 13 x 19" for Photos/Prints/Posters. 13-3/4 x 19-3/4 x 2". BLUE-GRAY. Drop-front. Acid-Free, Lignin-Free, Buffered.

Museum Grade Storage Box 13 x 19" for Photos/Prints/Posters. 13-3/4 x 19-3/4 x 2". BLUE-GRAY. Drop-front. Acid-Free, Lignin-Free, Buffered.

The archival material used for these boxes is 60 ptpoint, solid-core, acid-free, lignin-free cellulose fibers. It is buffered with a 3% calcium carbonate, which blocks migrant acids, The boxes have a pH of about 8.5. They have metal-edged corners and ship assembled. Boxes have passed the Photo Activity Test certifying that they are safe for the indefinite storage of photos.