The colors of rubies and emeralds are so striking that they define shades of red and green—ruby red and emerald green. But ...

The colors of rubies and emeralds are so striking that they define shades of red and green — ruby red and emerald green. But have you ever wondered how they get those colors? One feature of compounds ...

The colors of rubies and emeralds are so striking that they define shades of red and green – ruby red and emerald green. But have you ever wondered how they get those colors? One feature of compounds ...

Daniel Freedman does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) One feature of compounds made with transition metals is their intense color. There are ...