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papel alcalino
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acid free ink

A type of paper used for preservation.

acid free ink
1
What we know is that paper can be handled only so much and preserved only so long (even if it is non- acid paper).
The Civilization of Illiteracy
1
The life of books is shorter (despite their being printed on acid-free paper).
The Civilization of Illiteracy
2
Many collectors mount valuable, fragile posters on acid-free paper attached to canvas to protect them and to allow restoration.
BBC
3
Each corpse was carefully removed from what remained of its pine or oak coffin and was wrapped in acid-free paper.
Vampire forensics: uncovering the origins of an enduring legend
4
Printed on acid-free paper.
Alice in quantumland: an allegory of quantum physics
5
ISBN 0-387-91495-1 ( acid-free paper) 1.
Alice in quantumland: an allegory of quantum physics
6
"Also," added the small one, "old books are printed on acid-free paper, so we aren't getting acid inside of our lungs."
The Big U
portugués
papel alcalino