Czech uranium dragons breath glass block lampwork beading craft art installation

Czech square block of uranium dragons breath glass. This is extremely rare glass that not only glows beautifully under UV light but also has electric blue flashes of light from the dragons breath glass in the block. A unique and rare find to be kept as a collectors piece, for experienced glass blowers, for art installations or button and bead makers. As can be seen from the pictures, this has a few air bubbles and creasing to the surface.

Size: 200mm x 200mm x 25mm;
Weight: 2.7kg each
Material: glass
Year: Vintage 
Origin: Czech
Condition: vintage condition. 
Quantity: 1

Uranium glass contains depleted uranium oxide, which gives the glass a yellow or yellow-green tint, but not radioactive, and causes it to glow under a UV black light. Uranium glass became popular in the mid-19th century, with its period of greatest popularity being from the 1880s to the 1920s.