Silica gel blue is another alternative for controlling dampness which is acquires cobalt chloride in it. At the point when silica gel is engrossing dampness, gel’s dots shading is change from blue to purple to pink, this is demonstrate the gel should be supplanted or recover. The purpose for is cobalt chloride. The creation and evacuation of blue silica gel is troublesome in light of the fact that cobalt chloride is toxic.Blue silica gel is additionally accessible precious stones froths which ingest around 8 percent of its weight in water. It is DMF free, non-destructive, non-harmful, scentless and bland.