Humidity indicators
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United States of America Patent
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Jun 22, 2004
Grant Date -
N/A
app pub date -
Oct 22, 2001
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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