In this type all the gel particles are impregnated with an indicator. When free from moisture the crystals of silica gel are blue. As they are put to use the beads can take up moisture.- Mainly used for absorbing moisture, anti-rusting of instruments, gauges and equipment in the enclosed conditions. After absorbing moisture, it turns from blue to pink, visually indicating the relative humidity of the given environments.
- When being used with ordinary silica gel or drier, it indicates to which extent the drier absorbs the moisture and judges the relative humidity of a given environment. It is widely used as silica gel drier for the packing of precision instruments, leathers, shoes, clothes, foodstuffs, medicines and household electric appliances etc.
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