The blue silica gel (indicating type desiccant silica gel) is a semi-transparent glassy substance, containing an indicator as �cobalt chloride� a heavy metal salt. The granules or beads are dark blue in color when they are free from moisture. As the graduals take up moisture, they turn to light blue gradually, when dark blue silica gel�s color of crystal turns from blue to pink, or color less it has absorbed approximately more than 8 % percent of its weight in water making it an easy visual indicator to see whether gel has become saturated with water.

The blue silica gel (indicating type desiccant silica gel) is a semi-transparent glassy substance, containing an indicator as �cobalt chloride� a heavy metal salt. The granules or beads are dark blue in color when they are free from moisture. As the graduals take up moisture, they turn to light blue gradually, when dark blue silica gel�s color of crystal turns from blue to pink, or color less it has absorbed approximately more than 8 % percent of its weight in water making it an easy visual indicator to see whether gel has become saturated with water.