Ingesting silica gel causes dehydration and discomfort. Richardson H W 1993 Cobalt compounds, in Encyclopedia of chemical technology (eds) J I Kroschwitz and M Howe-Grant (New York: John Wiley & Sons) Vol 6, p. There are numerous harmful effects of silica gel, especially the form that contains cobalt chloride. Real C, Alcala M D and Criado J M 1996 J. In Inorganic and metal-containing polymeric materials (eds) J E Sheats et al (New York: Plenum Press) pp. Thats right our orange to green indicating is made with NO cobalt chloride whatsoever Interteck has brought the ultra-easy color change to silica gel beads. This is the reason most silica gel packets are labeled as dangerous or poisonous when eaten. Lender P W and Ruiter R 1990 Novel inorganic materials and heterogeneous catalysis. Cobalt (II) chloride is deep blue when dry (anhydrous) and pink when moist (hydrated). How does the structure change as water molecules are added Anhydrous CoCl 2 has the same structure as cadmium. Silica gel is sometimes supplied containing some cobalt chloride, which indicates the water content blue when it is dry, pale pink when the air round it is damp. Krishnarao R V and Godkhindi M M 1992 Ceram. When you heat the gel, it loses the water so you can reuse it. Kamath S R and Proctor A 1998 Cereal Chem. Kalapathy U, Proctor A and Shultz J 2000 Bioresource Technol. The cobalt chloride is a deep-blue color when dry and transitions from blue to pink as the desiccant saturates. Iler R K 1979 Silica gels and powders-the chemistry of silica (New York: John Wiley and Sons) p. Blue indicating silica gel is a bead or granule that has been washed with a concentration of cobalt chloride (a heavy metal salt). Holleman-Wiberg 2001 Inorganic chemistry (San Diego: Academic Press) 1st edn, pp. On the other hand, orange silica gel is non-toxic and is widely used in the. Solids 145 75Ĭossarutto L, Zimny T and Kaczmarczyk J 2001 Carbon 39 2339Ĭunha J C C and Canepa E M 1986 Research Project Report, Fundatec, Porto Alegre, R S, Goncalves M R F and Bergmann C P 2007 Constr. Blue indicating silica gel contains cobalt chloride and has been banned by the EU. 134 39īrinker C J and Scherer G W 1990 Sol-gel science-the physics and chemistry of sol-gel processing (New York: Academic Press Inc) pp 839–880Ĭonradt R, Pimkhaokham P and Leela-Adisorn U 1992 J. 103 284īalkose D, Ulutan S, Ozkan F C, Celebi S and Ulku S 1998 Appl.
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