... , anti-rusting of instruments, gauges and equipment.indicates to blue/orange silica gel indicator1. Mainly used for absorbing moisture, anti-rusting ... enviroments2. When being used with ordinary silica gel or drier, it indicates to which extentthe drier absorbs the moisture and judges ... a given enviroment.3.It is widely used as silica gel drier for the packing of precision instruments,leathers, shoes, ...