The alkali metal caesium, which becomes liquid if warmed in the hand, is one of the most reactive elements and explodes violently on contact with water. Here the sample is safely contained in a solid block of clear acrylic, which allows you to appreciate caesium’s beautiful pale golden colour. 

The element europium is one of the most difficult to prepare as a stable shiny metal sample. It darkens in seconds on exposure to the air. We are therefore delighted to have found a way to manufacture these europium metal crystal samples permanently sealed under inert argon. 

The longest-lived isotope of the element radium has a half life of only 1,600 years, which means that it is highly radioactive. It was once used as an ingredient in luminous paint for watch hands and aircraft instrument dials. 

We are able to supply metallic samples of two radioactive elements: thorium and uranium. This one is uranium. A special export licence is required for shipments outside the EU and we can help with the application process.