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PHOTO / NEGATIVE ENVELOPE, 5" x 7", Acid-Free Buffered - PKG of 100
These envelopes are buffered with 3% calcium carbonate to help counteract migrant acidity. Perfect for storing nitrate and acetate negatives and newspaper clippings. Cellulose fibers such as cotton, flax, linen and jute, as well plant-based specimens, can be stored in buffered material.