Cobalt Chloride has been classified by IARC (International Agency for Research on Cancer) in Group 2B which states Cobalt Chloride is a possible carcinogenic to humans. Cobalt Chloride is very toxic to aquatic organisms and may cause long term adverse effects in the environment.
Blue Indicating Silica Gel:
The most common use for Cobalt Chloride is in a type of Desiccant
named Blue Indicating Silica Gel. This product is in bead form and
will turn from Blue to Pink when full absorbed. This is one of the
most widely used indicating desiccant products and poses health
risks and environmental issues.