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Knowing the “climate” of your library is an important step in preventing or limiting mold outbreaks. You can do this quite simply by maintaining a record of the temperature and relative humidity of various locations within your library. This gives you an idea of what you are contending with. In addition, it provides you with a history of climate changes your collection undergoes, and provides supporting evidence if you seek funding to address mold issues in your library.

How to Make a Hygrometer
A Word About Thermometers
Taking Measurements with Your Hygrometer
Assessing Your Hygrometer Readings
Relative Humidity Table
Relative Humidity Tracking Chart


Books Gone Bad - Mold in Library Collections was a project sponsored by Maine College of Art, in partnership with the Joanne Waxman Library. Funding for this project came from the Stephen and Tabitha King Foundation. The Project Lead and Artist for this project was Diane J. Wren. All contents Copyright © 2011 by Diane J. Wren. All rights reserved. No part of this web site may be reproduced or distributed in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, or stored in a data base or retrieval system, without the prior written permission of Diane J. Wren.