On 16 December 2013 the European Chemicals Agency added the following seven substances of very high concern to the Candidate List for REACH authorisation: cadmium sulphide; disodium 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis(4-aminonaph thalene-1-sulphonate) (C.I. Direct Red 28); disodium 4-amino-3-[[4'-[(2,4-diaminophenyl)azo][1,1'-biphenyl]-4-yl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulp honate (C.I. Direct Black 38); dihexyl phthalate; imidazolidine-2-thione (2-imidazol