Finally back to the lab, and starting the work with something really simple: separation of copper salts (mainly copper cyanide and bromide) from the reaction mixture with aqueous ammonia solution.
The reaction products are in the bottom dichloromethane layer and the inorganic, mainly copper salts are in the upper aqueous phase. The deep blue color is caused from the tetraamminecopper(II) bromide complex what formed during the reaction.
Interesting fact: it is widely known that tetraamminecopper(II) ions have a deep blue color, while the copper(I) ions have no color. If you place metallic copper into a solution what contains copper(II) ions, the color of the solution will fade, due the copper(II) ions are reduced into colorless copper(I) when the react with the copper metal. So: Cu(II) + Cu = 2 Cu(I)