Spoiler alert: almond butter isn’t phosphorescent. But powdered milk is, at least to the limit of detection of this homebrew phosphorescence detector. Why spend a bunch of time and money on such ...

[Hydrogen Time] decided to make a green phosphorescent material, and has shared the process on Youtube, embedded below. The aim is to produce zinc sulfide crystals doped with copper impurities.

There are many varieties among the forms of life that emit from their surfaces and various parts of their bodies a powerful luminosity, and are called phosphorescent. It has been supposed by some ...