Infinity Archival Gummed Paper Photo Corners, in Black or Olde White, are made of acid-free paper with a safe gummed adhesive that won't damage photo emulsions. Moisten to apply. Infinity Archival Mylar Photo Corners are clear Mylar backed with a non-yellowing self-stick acrylic adhesive. They stick with a touch to your album pages. See-Thru Mounting Strips, made of archival Mylar, hold artwork safely and securely. No adhesive touches the artwork. Peel the release paper on the one-ply acid-free Bristol strips to expose the pressure-sensitive adhesive. Use Archival Mounting Corners to safely mount lightweight prints, drawings or photographs. Made of clear, non-yellowing polyester, they're prescored for quick application. The permanent self-stick adhesive is approved for conservation use.