MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Test tube of copper/ water ion. H2O. The ions of transition metals are coloured. This makes it possible to tell which ion is present in a solution. The hydrated copper ion is pale blue because most of the absorption band is in the infrared part of the spectrum - 800nm.
Model release not required. Property release not required.