Keywords: Sodium tetrachlorocobalt(II).JPG Heating of concentrated sodium chloride and cobalt II chloride yields this blue coloration own original caption self-made 1 <br/> Transferred from http //en wikipedia org en wikipedia to Commons by User Quadell using http //tools wikimedia de/~magnus/commonshelper php CommonsHelper 2010-06-09 Chemicalinterest at http //en wikipedia org en wikipedia Released into the public domain by the author <br/> Original text Licensing Chemicalinterest Original upload log page en wikipedia Sodium_tetrachlorocobalt 28II 29 JPG 2010-06-09 20 25 Chemicalinterest 1280×960× 199194 bytes <nowiki> Heating of concentrated sodium chloride and cobalt II chloride yields this blue coloration self-made ~~~~~ ~~~ none </nowiki> Sodium chloride Cobalt II chloride Test tubes |