Humidity indicators
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United States of America Patent
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Aug 9, 2005
Grant Date -
Oct 21, 2004
app pub date -
May 10, 2004
filing date -
Apr 22, 1999
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Abstract
Silica-based carrier impregnated with iron(III) or iron(II) salts functions as a humidity indicator giving a yellow/amber to nearly colourless colour change as the carrier humidifies.
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