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<p>[QUOTE=&quot;RickieB, post: 805675, member: 2486&quot;]O2 alone will not directly cause degradation, it is the combination of humidity and temp that cause the problems. Storage in a cool dark place with ample silica gel would be a desirable location for note storage. I would look up the recommended humidity level for Paper Storage and I would think it to be in the 20-30% range..lack of humidity will cause drying, cracking and other maladies, just as winter dryness does to your skin...and remember that our atmosphere contains ~ 20% O2</p><p><br /></p><p>Most analytical O2 sensors measure the dissolved O2 in a liquid, therefore, a Zirconium Dioxide Sensor is used for O2 measurement within a gas mixture and Infrared for CO2 measurement in a gas mixture. This is why a relative humidity sensors is best for maintaining correct reading in ambient temperature applications. Yes temperature has a resounding effect on humidity...</p><p><br /></p><p>Just food for thought.</p><p><br /></p><p>RickieB[/QUOTE]</p><p><br /></p>

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