Neptunium (Np3+) has a beautiful alexandrite effect. Left is one lab, center is natural sunlight, and right is a lab under fluorescent lighting. 5f-5f transitions are magical. This is the same solution. Some great pics taken by @jp_brannon #fblockrocks #actinides

I love pictures of clean californium. This small quantity has enough gamma radiation to give you your annual background dose in ~30 minutes on contact pictured here is the oxalate #fblockrocks

Hi bluesky, meet blueplutonium #fblockrocks