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In page Cigar:

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Most humidors come with a plastic or metal case with a sponge that works as the humidifier, although most recent versions are of polymer acryl. The latter are filled only with distilled water; the former may use a solution of propylene glycol and distilled water. Humidifiers, and the cigars within them, may become contaminated with bacteria if they are kept too moist. New technologies employing plastic beads or gels which stabilize humidity are becoming widely available.[citation needed]