MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Test tube of copper/ammonia complex ion. NH2. The ions of transition metals are coloured. This makes it possible to tell which ion is present in a solution. The copper/ammonia ion is dark blue because the absorption band is in the green part of the spectrum - 620nm.
Model release not required. Property release not required.