3 Spot Humidity Indicator Card P/N: 3HIC125 Popular for military applications, this card is approved for use by DOD, NATO, and governmental agencies for Method II packaging. Humidity Indicator Cards (HIC’s) are printed with moisture sensitive spots which respond to various levels of humidity with a visible color change from blue to pink. HIC's are placed inside vacuum sealed (dry packed) moisture barrier bags. When the bag is opened, the card can be examined for proper dryness inside the bag.