Does anyone know how archival heavyweight sheet protectors are (Avery PV119G-74107)???? The package says archival safe and acid free but I know that can be dubious. Our museum uses these sheet protectors to store object identification photographs in our manilla file folders. The photographs are not really the best photographs we have available and certainly not adequate for publication -our inhouse photographer stores negatives of images used for publication. These ID photos are being used just for identifying the art objects. Does anyone know of the sheet protectors' lifespan, will it off-gas, will it eventually detroy the photographs? Does anyone know of another product that can be used that is inexpensive (I think Mylar envelopes are $8.00 for a pack of 10 and we have thousands of photos)? I thank you in advance for any help or comments you can send my way. Holly Chase Assistant Registrar Museum of Art, Brigham Young University North Campus Drive Provo, UT 84602-1400 Phone: 801-378-8248 Email: [log in to unmask]