the Humidity Indicator Card (HIC) is to ensure that the outer moisture barrier bag and inner desiccants work normally. the Humidity Indicator Card (HIC) is to ensure that outside moisture barrier bag and inside desiccant work normally. Our HIC can be made into cobalt-free. All products are environment-friendly and safe for using. On HIC, there are several dots and different dots indicate different relative humidity degrees. The color will change from blue to pink along with the humidity degree changing, which can help us decide whether the desiccant or its outside package needs replacement. (Cobalt free HIC color will change from yellow to light green)