PRUESI ™-G45CB is a form of granular indicating silica gel that changes colour; to demonstrate its saturation level – moving from yellow (dry) to greenblack (when saturated). Granular silica gels, are used in preference to beaded gels, where customers need to pack a specific mass of silica gel into a limited space. This can be achieved because PRUESI ™-G45CB granules are of irregular shape and size – so pack-in tightly without creating large void spaces in-between themselves (unlike beaded indicating gels).