![]() ![]() Therefore, the water turns the blue cobalt chloride Peper into the pink. Orange silica gel desiccant is the latest alternative to blue indicating silica gel (cobalt chloride). I read recently that cobalt chloride is a carcinogen and harmful to reproductive health. I figured this was a great choice since we use it on desiccant breathers at work and the color change was always pretty useful. Such distinct change in colour makes cobalt chloride useful as the humidity indicator in weather instruments. Cobalt Chloride is blue when dehydrated and pink when saturated. Dangers of cobalt chloride coated silica gel desiccant Silica gel is not considered very dangerous as per directive of FDA (USA). Silica gel containing cobalt chloride I began using blue indicating desiccant gel to store petg. The hexahydrate complex of cobalt chloride is pink in colour. The reaction for the formation of hexahydrate as follows:ĬoCl2.2H2O(Purple)+ H2O→CoCl2.6 H2O(Pink) This time the four more water molecules surround the cobalt resulting in the formation of hexahydrate cobalt chloride. The reaction for the hydration of cobalt chloride is represented as follows:Īs the crystal is further exposed to the water the crystal structure changes. Cobalt is present in small concentrations (0.5 to 1.0 by weight) in indicating silica gel. On exposure to the water or the water vapours, the cobalt chloride absorbs the water molecule.įirst, the two water molecules surround each cobalt atom and result in the formation of dehydrate. As the humidity increases the cobalt chloride changes the colour from sky blue to the purple and then to the pink. gel come coated with cobalt chloride, which is considered toxic. Envirogel indicates an orange/yellow colour when active and. Silica gel is a form of the naturally occurring mineral silicon dioxide, better known. Color change of silica gel: Due to presence of CoCl2,Ĭobalt chloride changes the colour in response to the humidity. Envirogel desiccant is the latest alternative to blue (cobalt chloride) indicating silica gel. ![]()
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