What sort of paper do you use? Is it acid-free?

It is nice paper, and yes, it is acid-free.  For the gory details, see “paper specifications” at  Lightning Source – Client Education .

For books printed by LSI, the “paper durability notice” on the copyright page (Chicago Manual of Style 15 $1.35) should read:

 The paper used in this publication meets the minimum requirements of the American National Standard for Information Sciences—Permanence of Paper for Printed Library Materials, ANSI Z39.48-1992. The paper is acid-free and lignin-free.

The circled infinity sign is Unicode codepoint 267E.  The key gotcha is that the font you are using must contain a version of the symbol–most standard Windows fonts do not contain the symbol.  Luckily, there is an extra-cool online Font Support Tool that shows you how the Unicode character looks in all of the fonts you have on your local PC.  For my PC, the answer is that DejaVu Sans includes a circled infinity sign for Unicode 267E.

If you want a less difficult route, I suggest LSI’s wording:

This paper is acid free and lignin free. It meets all ANSI standards for archival quality paper.

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