This is the most beautiful scientific diagram I've ever seen.
Also a great example of why pink is a tint of red, but also a completely different color. Erbium? Neodymium? So beautiful.
FYI Neodymium glass (aka Alexandrite glass to collectors) appears different colors under different lights:
This image is from a great writeup of why that happens on the Jennii Neutron blog.
Oh and of course Uranium, Selenium, Manganese, and Cadmium all fluoresce under black light.

























