Seller: busterandchico (619) 100%, Location: Midlothian, Virginia, Ships to: US, Item: 143427412077 Authentic Archival Acid Free Tissue Paper. Shipped with USPS First Class Package. The 20x30" unbuffered 12# archival tissue paper is made using 100% clean, virgin, chain of custody bleached softwood and hardwood fiber in order to eliminate contaminants found in other raw material sources. It does not contain any dyes, pigments, brighteners, or other chemicals that could affect the chemistry of the sheet, therefore no residue will be left on any material. Unbuffered tissue is ideal for most items that are going to be stored for a long time; including but not limited to wedding dresses, silks, wools, blueprints, dye transfer prints, cyantypes, pearls, paintings/artwork, and silver. If you are not sure whether you need buffered or unbuffered tissue paper, use unbuffered tissue paper. To further speak to the excellence of this unique paper, it has a PH between 6.5 and 7.5, as specified in Federal Specification UU-P-553C. This paper has also passed a Photographic Activity Test, and the TAPPI T 444 test for silver tarnishing by paper and board, ensuring that it is safe to use in direct contact with photographs, important documents, jewelry, and other fine metals. The appearance of the sheet is bright and clean, and has a slight yellow tint when compared to standard white tissue due to the lack of a blue tinting pigment; which along with all the other properties listed is crucial for a good anti-tarnish tissue paper. Fast Shipping.