Blue indicating silica gel is impregnated with cobalt chloride which changes from blue to pink as the desiccant becomes saturated. This visually warns inspectors of the need for replacement.With the introduction of a European directive, cobalt chloride impregnated silica gel has been classified as a carcinogen. Therefore the handling and disposal of this desiccant must conform to relevant health and safety, and special waste regulations.

Enviromental Orange Gel desiccant is the latest alternative to blue indicating silica gel. Enviromental Orange Gel is impregnated with a safe orga.