SILICA GEL SELF INDICATING BLUE 6-20 MESH
Application
This silica gel is a bead or granule that has been washed with a concentration of cobalt chloride (a heavy metal salt).
Dosage
Blue silica gel has cobalt chloride, which allows the blue silica gel change its color to pink when it reached its maximized adsorption capacity. Once pink it can be reactivated with heat to dry out the moisture. When it turns blue again, it's ready to use.