JR Humidifier Card JRCARD
JR Humidifier Cards are filled with a solution of cobalt chloride that has been carefully mixed to change color from blue ( fully charged), to pink when it no longer releases humidity. These cards are not precision indicators. However, they are very good at telling you about the maximum possible humidity in a small container, travel humidor, Ziplock bag, or any other style of cigar humidifying device. The humidity card itself is reusable. When the humidity level is low, the dots will change from pink to blue again. With long use, the color of the dots fade. Then, you can replace the card.
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