Humidity Indicator Cards

To make sure your moisture barrier bags and desiccants have completed their job, add a humidity indicator card. Moisture-sensitive spots on the cards act to various levels of humidity with a visible color change from blue to pink. Take a look at the card when you open the bag. The card will indicate the humidity level of whatever you are packaging. For more information on selecting the right packaging for long-term storage, see our article on what types of packaging are most reliable for long-term storage.

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