the Humidity Indicator Card (HIC) is to ensure that the outer moisture barrier bag and its desiccants work normally. Our cobalt-free HIC is environment-friendly and free of carcinogen, safe for using. On HIC there are several points and different points can indicate different humidity degrees. The color will change from blue to pink along with the relative humidity degree changing which besides helps us decide whether the desiccant or its out packing needs replacement. HIC includes one-point, three-point, four-point and six-point types.