Silica gel blue is a semi-transparent glassy substance that contains an indicator called “cobalt”. When free from moisture, the beads are dark blue in color.Once the Silica Gel Blue picks up the moisture and get saturated it turns in to pink color . This indicated that Silica Gel need to be replaced with fresh one or regenerated. Silica Gel Beads and Crystals are available in different sizes in mm and mesh with high absorption capacity which is used for industrial gases drying, compressed air drying, and other various applications as a solution of moisture.