The primary aim of using silica gel is to protect products and equipment from moisture and humidity disruption. It is thought to be the most efficient way to maintain moisture levels moderate so that packaging materials and other uses are not harmed. The blue crystals of silica gel have the ability to trap moisture in enclosed containers, decrease humidity levels within large containers or storage spaces, and resist corrosion of equipment and instruments. It's also known as blue desiccants and indicating silica gel.
Silica gel blue crystals have a glassy, semi-transparent appearance and contain cobalt as a colour predictor.