| 摘要 |
PROBLEM TO BE SOLVED: To preserve documents, pictures, etc., stably for a long period by preventing the deterioration in quality of them. SOLUTION: Bags are formed from paper 1 free of acid, alkali, and size, and paper 1 having functions of humidity control, neutralization, and antimicrobial activity is housed in the bag. An object to be preserved is placed between the bags.
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