Cobalt chloride, which was listed as a class ii carcinogen in the 2004 EU environmental regulation (2004/73/EC), is now banned on the cobalt-containing humidity indicator card and all products exported to the EU must meet the requirements of the regulation.So the now ubiquitous humidity indicator card( color change from blue to pink), whose main ingredient is cobalt chloride, will soon be banned to use. Such as SONY had forbid to use  humidity indicator card and other products containing cobalt chloride, EU have requirements about the HIC：As early as January 2003, the EU parliament and council adopted the RoHS directive, the full name is  The Restriction of the use of certain Hazardous substances in Electronical and Electronic Equipment,That is, the directive to restrict the use of certain hazardous substances in electronic and electrical equipment, also known as the 2002/95/EC directive, which was supplemented by the eu in 2005, clearly stipulated the limits of six hazardous substances.Brominated flame retardants such as PBB (Polybrominated Biphenyls) and PBDE (Polybrominated Diphenyl Ethers) were banned on 1 July 2006.
The RoHS directive requires restrictions on these six hazardous substances: Pb (lead), Hg (mercury), Cd (cadmium), Cr6+ (hexabalent chromium), PBBs (polybrominated biphenyl ether), and PBDEs (polybrominated diphenyl ether). Polybrominated biphenyls, which contain halogens.