Surely you've seen a UV light. ... There are some materials---like fused quartz or fluorite that do exactly this and can be used to make some pretty cool UV photographs.

UV photography is a highly specialized subset of photography and often involves specific types of modified cameras that can see light from spectrums outside the typical visible wavelengths. In order ...

Calcite, fluorite, and willemite are some of the minerals that do this. Under short-wave UV light, willemite looks like it is freckled with green slime. Calcite, on the other hand, ...

Mostly thanks to the inclusion of vivo's Fluorite AG UV-reactive glass back surface that changes color when hit by light. This allows users to create temporary patterns and imprints on the V25.