Buffered Perma Dur® Negative Envelopes
University Products acid-free Perma/Dur Negative Envelopes feature side seams for even filing and stacking and are constructed using a neutral pH adhesive. The material is ivory coloured Perma/Dur® buffered with 3% calcium carbonate to help retard migrant acidity. Passes Photographic Activity Test.
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| |  Unbuffered Perma Dur® Negative Envelopes
from £19.50 More Details
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