Boxes are buffered with a 3% calcium carbonate buffer, which keeps acids out of the box. This material is used by the Library of Congress for indefinite term storage.
| To keep them valuable store your most valuable comics in our archival comic storage box. It’s made for a acid-free and lignin-free blue-gray corrugated cardboard. Boxes are buffered with a 3% calcium carbonate buffer, which keeps acids out of the box. This material is used by the Library of Congress for indefinite term storage. |
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